I received a report from Secunia this morning which alerted me to a vulnerability in register.php which allows abuse of the $activate variable, I have now fixed this issue. Meanwhile, whilst going over the photo gallery code in preparation for v6.00.2's imminent release I discovered two exploits (I really am going to have to teach devs how to sanitise variables). Needless to say, I've fixed it, sheesh, I do all the coding, I do all the fixing, I'm a slave! So v6.00.110 is now out, also including improved photo/photoalbum admin panels.
The full download at sourceforge has been updated to v6.00.110. Existing users can simply upload the files contained in the 6.00.110up zip and then click Upgrade under System Admin in your Admin Panel. Download v6.00.110 update (17Kb).