Guys I had the same problem.
Downgrade your adium to a recent release.. I had 1.3.6 something like that.. It has some bugs occasionally, but it's good for now.
Add and or cancel adding other people.. it will sometimes crash but it will get back up.
Version 1.4 seem to also have the problem, I know version 1.3.6 doesn't have that bug, try it.
Hope it helps you!