The confirmation code doesn't match for the contact and the registration form as well as for posting comments. Since I don't want to block new users from registering, the registration process is not using any captcha at this moment.
Also, I have created a test account (username:test, password:test) on my gallery and I have re-uploaded a newly downloaded copy of cpg156 over it but it didn't solve the problem.
To have a better idea of the nature of the problem, I have created a new gallery (a test user is availale there too; user: test, password: test) using a new database and fresh copy of coppermine (
http://www.dragnix.net/test/ ) to see if this problem was caused by the upgrade process or if there was issues with my database / modifications with my gallery. But the captcha still gives me the same result. The Test gallery doesn't contain any modification and is set up with the default values (except for the option allowing guests to post comments). The files on both gallery have been uploaded using the latest version of Filezilla, and the versioncheck function doesn't see any problem.
Yesterday, in captcha.inc.php, I changed
$aCharSet = array(), // array of characters to select from - if blank uses upper case A - Zto
$aCharSet = array('A'), // array of characters to select from - if blank uses upper case A - ZBut the captcha still reports that the confirmation code doesn't match even if the answer is always "AAAAA". This change has been reverted back to normal when I re-uploaded an unmodified version of the file.
I'm not really sure what to do next... My site is hosted by Ipower.