No problems here, either. I've been using it more or less every day since I got my Air (1.6/80), and I've had no problems at all. I don't use Chinese character sets, though, so I don't know if it's that making the difference.
I'm having the exact same problem. Does anyone know what to do about this issue? I hadn't used Adium in about a month. Then, I tried to start the program and it took almost two hours and all my system resources to start. The hang up took place during the account loading phase. I've never had a program do this. I threw out the app and downloaded it again and still have the same problem. Thoughts? Could it be one of my contacts?
Use Activity Monitor to check Adium's cpu usage. If it's unusually high, please follow the steps at http://trac.adiumx.com/wiki/Sampling and file a bug report (or post it here if you really hate filing bug reports for some reason).