Cannot make any changes to photos, galleries or settings. Don't see errors.

Hi All, I've been using Gallery2 for many years. Recently, I have lost the ability to change any photos or settings in gallery. I can still see everything there. First I cannot log in normally. I have to use a full URL with login info. I can go to the Admin Options but I'm only able to run the maintenance tasks and deactivate plugins. If I try to change any settings, for example- change file locking system to database locking- it wont save the changes. If I try to add or delete a photo, nothing happens. It just returns me to the main page and I don't see any errors. I go back to the page and the settings or pics are still the same.

Please help. Thanks!

Gallery version = 2.2.1 core 1.2.0.1
PHP version = 5.2.17 cgi-fcgi
Webserver = Apache/2.2.17 (Unix) mod_ssl/2.2.17 OpenSSL/0.9.8e-fips-rhel5 DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635
Database = mysql 5.0.92-community, lock.system=flock
Toolkits = ImageMagick, Thumbnail
Acceleration = none, none
Operating system = Linux wor.worldaccess.org 2.6.18-028stab070.14 #1 SMP Thu Nov 18 16:04:02 MSK 2010 x86_64
Default theme = matrix
gettext = enabled
Locale = en_US
Browser = Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1
Rows in GalleryAccessMap table = 328
Rows in GalleryAccessSubscriberMap table = 2580
Rows in GalleryUser table = 6
Rows in GalleryItem table = 2573
Rows in GalleryAlbumItem table = 437
Rows in GalleryCacheMap table = 0

Hi, Thank you for your help. I ran the "Delete database cache" and "Delete template cache" and its says "Success" But it has not solved the problem or made any noticeable difference. Any other ideas?

Cheers