Checking on Firefox Mobile on my android phone. It's probably cause my phone is small but the words run off the side. Plus, I can't get into the control panel or get into my messages. I'll upload some pics so you can see (Warning these pics are kind of big).
If you look near the top right of the second picture you can kind of see the end of the log out button. That's what happens when you click the control panel. Clicking the menu button doesn't show anything (I assume it pops up over the top again). I also can't click anything under the menu button when I scroll down the page.
The desktop version is nice though. Took me a minute to find everything but I really like it. The only things I would change is making the boxes for each forum bigger so they fill all the space, maybe add a small light colored (white or gray) box around quotes since they blend in with the page and are easy to miss if you skim, and maybe change the online/offline buttons since everything is nice and flat except for them.
EDIT: Another thing: The edit, quote, and reply buttons don't have a message when you scroll over them.
EDIT (again):
Just a small thing: it seems to stretch out signatures. Never mind, figured it out. The default font size seems bigger than the other theme I was using (Lets Fly Together) and it caused the signatures to expand.