I am guessing that there is a 501 error on your server that is being hidden hence you are only seeing a blank page. You may have the option in your cpanel to see the error or you could ask your host what the actual error message is. That will really help in diagnosing the problem.
A list of my recent error log from cPanel is:
[Sat May 02 17:31:27 2015] [error] [client 95.154.207.60] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 17:21:21 2015] [error] [client 198.11.211.202] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 17:19:15 2015] [error] [client 176.9.144.81] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 17:14:10 2015] [error] [client 77.222.61.11] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 17:13:46 2015] [error] [client 1.120.181.8] File does not exist: /home/jasonand/public_html/photogallery1/images/img07.gif, referer:
http://www.jasonandrewmurphy.com/photogallery1/index.php[Sat May 02 17:13:45 2015] [error] [client 1.120.181.8] File does not exist: /home/jasonand/public_html/photogallery1/style.css, referer:
http://www.jasonandrewmurphy.com/photogallery1/index.php[Sat May 02 17:13:45 2015] [error] [client 1.120.181.8] SoftException in Application.cpp:601: Directory "/home/jasonand/public_html/photogallery1" is writeable by group, referer:
http://www.jasonandrewmurphy.com/[Sat May 02 17:11:38 2015] [error] [client 1.120.181.8] File does not exist: /home/jasonand/public_html/photogallery1/images/img07.gif, referer:
http://www.jasonandrewmurphy.com/photogallery1/index.php[Sat May 02 17:11:37 2015] [error] [client 1.120.181.8] File does not exist: /home/jasonand/public_html/photogallery1/style.css, referer:
http://www.jasonandrewmurphy.com/photogallery1/index.php[Sat May 02 17:11:37 2015] [error] [client 1.120.181.8] SoftException in Application.cpp:601: Directory "/home/jasonand/public_html/photogallery1" is writeable by group, referer:
http://www.jasonandrewmurphy.com/[Sat May 02 17:11:31 2015] [error] [client 1.120.181.8] File does not exist: /home/jasonand/public_html/photogallery1/images/img07.gif, referer:
http://www.jasonandrewmurphy.com/photogallery1/index.php[Sat May 02 17:11:30 2015] [error] [client 1.120.181.8] File does not exist: /home/jasonand/public_html/photogallery1/style.css, referer:
http://www.jasonandrewmurphy.com/photogallery1/index.php[Sat May 02 17:11:29 2015] [error] [client 1.120.181.8] SoftException in Application.cpp:601: Directory "/home/jasonand/public_html/photogallery1" is writeable by group, referer:
http://www.jasonandrewmurphy.com/[Sat May 02 17:11:12 2015] [error] [client 1.120.181.8] File does not exist: /home/jasonand/public_html/images/img07.jpg, referer:
http://www.jasonandrewmurphy.com/style.css[Sat May 02 17:10:37 2015] [error] [client 77.222.61.78] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 17:01:47 2015] [error] [client 77.222.40.173] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 16:51:24 2015] [error] [client 5.135.189.151] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 16:46:38 2015] [error] [client 157.55.39.158] File does not exist: /home/jasonand/public_html/photogallery
[Sat May 02 16:43:56 2015] [error] [client 91.211.113.201] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 16:40:23 2015] [error] [client 176.31.128.38] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 16:30:44 2015] [error] [client 92.53.114.211] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 16:20:33 2015] [error] [client 5.101.157.117] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 16:20:29 2015] [error] [client 205.234.189.91] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 16:20:02 2015] [error] [client 157.55.39.229] File does not exist: /home/jasonand/public_html/photogallery
[Sat May 02 16:17:29 2015] [error] [client 157.55.39.158] File does not exist: /home/jasonand/public_html/photogallery
[Sat May 02 15:54:49 2015] [error] [client 109.71.208.50] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 15:50:07 2015] [error] [client 1.120.181.8] File does not exist: /home/jasonand/public_html/images/img07.jpg, referer:
http://www.jasonandrewmurphy.com/style.css[Sat May 02 15:49:21 2015] [error] [client 1.120.181.8] File does not exist: /home/jasonand/public_html/favicon.ico, referer:
http://www.jasonandrewmurphy.com/photogallery1/index.php[Sat May 02 15:49:11 2015] [error] [client 1.120.181.8] File does not exist: /home/jasonand/public_html/images/img07.jpg, referer:
http://www.jasonandrewmurphy.com/style.css[Sat May 02 15:28:26 2015] [error] [client 85.214.149.38] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 15:12:56 2015] [error] [client 173.44.39.15] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 14:37:34 2015] [error] [client 209.54.52.44] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 14:32:22 2015] [error] [client 151.236.48.166] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 14:28:36 2015] [error] [client 50.62.208.51] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 14:17:36 2015] [error] [client 148.251.40.249] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 14:08:47 2015] [error] [client 5.101.157.29] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 14:06:40 2015] [error] [client 69.20.94.148] Insufficient permissions: /home/jasonand/public_html/photogallery1/js/themes.php
[Sat May 02 14:06:16 2015] [error] [client 72.14.199.118] SoftException in Application.cpp:601: Directory "/home/jasonand/public_html/photogallery1/albums" is writeable by group
[Sat May 02 14:05:16 2015] [error] [client 72.14.199.118] SoftException in Application.cpp:601: Directory "/home/jasonand/public_html/photogallery1/albums" is writeable by group
[Sat May 02 14:05:13 2015] [error] [client 72.14.199.118] File does not exist: /home/jasonand/public_html/photogallery
[Sat May 02 14:05:13 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/images/img07.jpg, referer:
http://www.jasonandrewmurphy.com/photogallery/themes/[Sat May 02 14:05:13 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/photogallery
[Sat May 02 14:04:57 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/themes/[Sat May 02 14:04:57 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/themes/[Sat May 02 14:04:57 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/themes/[Sat May 02 14:04:57 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/hardwired/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 14:04:57 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/rainy_day/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 14:04:57 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/eyeball/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 14:04:57 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/sample/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 14:04:57 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/curve_red2black/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 14:04:57 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/water_drop/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 14:04:57 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/curve/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 14:04:55 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/photogallery1/style.css, referer:
http://www.jasonandrewmurphy.com/photogallery1/themes/blog.php[Sat May 02 14:04:55 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/photogallery1/themes/images, referer:
http://www.jasonandrewmurphy.com/photogallery1/themes/blog.php[Sat May 02 14:04:55 2015] [error] [client 98.249.199.20] Insufficient permissions: /home/jasonand/public_html/photogallery1/themes/blog.php
[Sat May 02 14:04:16 2015] [error] [client 72.14.199.124] SoftException in Application.cpp:601: Directory "/home/jasonand/public_html/photogallery1/albums" is writeable by group
[Sat May 02 14:03:15 2015] [error] [client 72.14.199.112] SoftException in Application.cpp:601: Directory "/home/jasonand/public_html/photogallery1/albums" is writeable by group
[Sat May 02 14:03:15 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/photogallery1/albums/images, referer:
http://www.jasonandrewmurphy.com/photogallery1/albums/[Sat May 02 14:03:15 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/photogallery1/albums/style.css, referer:
http://www.jasonandrewmurphy.com/photogallery1/albums/[Sat May 02 14:03:14 2015] [error] [client 98.249.199.20] SoftException in Application.cpp:601: Directory "/home/jasonand/public_html/photogallery1/albums" is writeable by group
[Sat May 02 14:03:09 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/css/[Sat May 02 14:03:09 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/css/[Sat May 02 14:03:09 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/css/[Sat May 02 14:02:59 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/css/[Sat May 02 14:02:59 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/css/[Sat May 02 14:02:59 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/css/[Sat May 02 14:00:51 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/logs/[Sat May 02 14:00:51 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/logs/[Sat May 02 14:00:51 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/logs/[Sat May 02 14:00:08 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/plugins/[Sat May 02 14:00:08 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/plugins/[Sat May 02 14:00:08 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/plugins/[Sat May 02 13:59:08 2015] [error] [client 72.14.199.124] Insufficient permissions: /home/jasonand/public_html/photogallery1/themes/blog.php
[Sat May 02 13:59:08 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/photogallery1/themes/images, referer:
http://www.jasonandrewmurphy.com/photogallery1/themes/blog.php[Sat May 02 13:59:08 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/photogallery1/style.css, referer:
http://www.jasonandrewmurphy.com/photogallery1/themes/blog.php[Sat May 02 13:59:07 2015] [error] [client 98.249.199.20] Insufficient permissions: /home/jasonand/public_html/photogallery1/themes/blog.php, referer:
http://www.jasonandrewmurphy.com/photogallery1/themes/[Sat May 02 13:58:53 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/themes/[Sat May 02 13:58:53 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/themes/[Sat May 02 13:58:53 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/404.shtml, referer:
http://www.jasonandrewmurphy.com/photogallery1/themes/[Sat May 02 13:58:53 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/hardwired/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 13:58:53 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/rainy_day/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 13:58:53 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/eyeball/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 13:58:53 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/sample/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 13:58:53 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/curve_red2black/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 13:58:53 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/water_drop/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 13:58:52 2015] [crit] [client 98.249.199.20] (13)Permission denied: /home/jasonand/public_html/photogallery1/themes/curve/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
[Sat May 02 13:56:30 2015] [error] [client 98.249.199.20] File does not exist: /home/jasonand/public_html/images/img07.jpg, referer:
http://www.jasonandrewmurphy.com/I do not know how to interpret all the errors and what they mean, however, when I changed the permissions to 777 and my gallery then produces a 500 Internal error...