Misbehaving? That isn't nice.
If it's the software, rather than something further in - I highly recommend downloading either Trillian (windows) or Adium (Mac) - both free chat clients that let you log into multiple platforms (MSN, yahoo, AIM, LJtalk, etc) at the same time on one single client, keep logs of your chats, and generally behave better. I love 'em both.