You need to describe your OS, PC, ISP and browser for these sort of issues.
Many of the glitches here are random and temporary. Read my blog and see if something in it helps. If not and the problem persists contact the staff directly via Help & Support.
http://blog.chess.com/NimzoRoy/diagnosing-and-fixing-internet-problems
The "position setup" and "game editor" tabs don't work for the analysis board. Just wanted to bring that to attention, since they sometimes would be useful to have.
Also, it'd be pretty cool to be able to copy the PGN from somewhere and clean out all the comments. I often like to offer analysis for others' games, but have to spend quite a long time simply deleting past comments every time, which is a bit of a nuisance sometimes.