Here's the issues I know about at this time:
Pending
Donate Button -- It's currently broken on some styles. Sorry; it'll be fixed soon.
It's also currently missing from the default phpBB themes (subsilver2 and prosilver), but it'll get there eventually. Edit: Missing from a few other themes as well. It'll come.
Styles -- ThorLarge -- It has some issues right now. The Belegarth logo at the top is supposed to be on the left side; not centered. I don't have the energy to fix it right now; it's four AM. It'll get fixed tomorrow probably.
General Mayhem Private -- I need to install a mod to do this, but it hasn't been done yet. I haven't forgotten, don't worry.
Fixed
Search -- It's either not functioning or a bit wacky right now.
Auto Login -- It's got some problems right now. I'm unsure if it's related to the redirect from the old server or if it's a problem with my board. This is probably top priority right now.
Mail -- Outgoing mail was not functioning as it should have. This would cause problems if you tried to use the 'Forgot Password' link.
It's fixed now, so give it another go if you weren't able to log in.
If you're still having trouble, email me at derian@nanbelegorn.com.
Styles -- Epoch -- The banner is blank and it says Belegarth below it. This will get fixed soon.
Online/Offline Status -- The text is huge and obnoxious. I'm looking into resizing it.
Avatars -- The avatars got hardcore **** during the conversion. If you have trouble viewing avatars, hit CTRL-F5 on your keyboard. That should fix it up for you. If your avatar is completely missing (it shouldn't be), try re-uploading. Hopefully that'll fix it.