Now a firefox user

Since installing the Community Server 2 beta I've been having a few
problems posting entries from IE7, get javascript errors when I click
'post' but it works fine in FireFox. When I'm logged in as admin in IE7
it works fine, and it used to work when logged in as lukesmith, but
then suddenly stopped the other day. Though CS2 beta isn't 100% FireFox
friendly either, errors occur in the odd place where they don't in IE.