Goto
Control Panel » Forum Permissions
Select your gallery forum and submit the switch button.
Then expand the "Maximum size of gallery images"
There is a note in there that states "If this forum is a gallery forum, this setting dictates how large each image may be. Max size set in php.ini is XX , so you may not exceed this size."
Let us know what is in the note where I have placed the xx above
And what you have entered for the group permission size.
Oh also what size are you wanting it to be.
