It´s not working cause when i save in config back to 'no'
for exemple when i save: Enable private messaging with yeas, I save ad then back to config and appear 'no' again

and notices are:
nclude/themes.inc.php
* Notice line 565: Undefined index: info_block_align
* Notice line 767: Undefined index: pms_enabled
* Notice line 780: Undefined variable: pm_link
* Notice line 2612: Undefined index: enable_loginform
* Notice line 1321: Undefined index: enable_buddy
/include/plugin_api.inc.php
* Notice line 230: Only variable references should be returned by reference
* Notice line 230: Only variable references should be returned by reference
* Notice line 230: Only variable references should be returned by reference
* Notice line 230: Only variable references should be returned by reference
/admin.php
* Notice line 114: Undefined index: enable_loginform
* Notice line 114: Undefined index: mini_as_category_lead
* Notice line 114: Undefined index: display_pic_rating
* Notice line 114: Undefined index: display_pic_voting
* Notice line 114: Undefined index: info_block_align
* Notice line 114: Undefined index: enable_mini_thumbs
* Notice line 87: Undefined index: mini_thumb_width
* Notice line 87: Undefined index: mini_thumb_height
* Notice line 87: Undefined index: watermark_transparency
* Notice line 87: Undefined index: watermark_transparency_featherx
* Notice line 87: Undefined index: watermark_transparency_feathery
* Notice line 114: Undefined index: pms_enabled
* Notice line 114: Undefined index: pms_make_links
* Notice line 114: Undefined index: pms_smilies
* Notice line 114: Undefined index: pms_message_bbcode
* Notice line 114: Undefined index: pms_message_img_tag
* Notice line 114: Undefined index: pms_enable_email
* Notice line 87: Undefined index: pms_messages
* Notice line 87: Undefined index: pms_date_format
* Notice line 87: Undefined index: pms_time_format
* Notice line 87: Undefined index: pms_post_flood
* Notice line 114: Undefined index: enable_buddy
* Notice line 114: Undefined index: enable_buddy_email
* Notice line 114: Undefined index: enable_buddy_private_view
* Notice line 114: Undefined index: buddy_enhanced_display
* Notice line 114: Undefined index: display_buddy_status
* Notice line 114: Undefined index: display_pms_status
* Notice line 114: Undefined index: enable_stats
* Notice line 114: Undefined index: fast_stats
* Notice line 114: Undefined index: enable_user_notification
* Notice line 114: Undefined index: enable_avatar