the 'problems' are mostly with the main site/home page, not the forums so much.
it's stuff like little layout things looking different/not as nice, and some of the margin content (the "what's going on?" calendar) not being as interactive/functional. hardly a huge deal, but if folks want to 'unlock the power'
and see the main site the way it was designed to be seen and used, they could consider switching to a different browser.
do a test greg- check out the front page
using IE (look at a few of the tabs, try to use the links/calendars/etc.), and then do the same in chrome or firefox...i'm pretty you'll like the look and response of the latter better than IE. my 2 cents.
i just want to ensure that i'm doing the best i can to get our members and users content in the most usable/accessible way possible.