Oh so i think I may have figured out what was happening.
When you click on the picture, you have to log in first. After logging in you will get a blank page.
(You have to tell me these things!)
But if you are logged in, you can still browse the gallery by just clicking the gallery link or going back to the home page and clicking the same image again, as long as you are logged in.

Anyhow I think I may have fixed that part that goes to a blank page now ...



...Also did another fix for logging in from the side menu box while in a forum topic. it no longer gives an 'topic no selected' error :)