Figures that I just closed your other support ticket a few minutes ago... I assume you've double checked the settings under both the 'Usergroup Permissions' and 'Category Permissions' sections, right? If that's correct, the best thing I can suggest would be to uplaod an un-hacked copy of your gallery/upload.php and forum/includes/functions_gallery_imageedit.php files and see if the problem still occures. If not, then obviously that means you're the one that broke it.
If it does still happen with the un-hacked files and you'd like to submit a new support ticket then I'll be glad to take a look.