Log In button has died!

[eues]

This has happened due to me upgrading our forum from 4.0.3 to 4.0.5. basically the upgrade didn't go exactly as I had planned (first time doing an upgrade). and it kinda killed my custom template.

I tried to work around and fix the template merging issues the best I could. and everything seems to be fine now, apart from one thing.

When you are moderating the forum, like deleting a post. It takes you to the bit where you verify your password to prove the legitimacy of the action. The Log In button doesn't work!! You press, and nothing happens. There's a screenshot to show exactly where this happens.

If anybody could point me in the right direction in order to get that fixed it would be totally great!

Thanks a lot.