Re: Xorg crashing.
Composite never was very stable. Are you using KDE? I am, and at first it was a nightmare. For instance, I had to change my theme. And I had to make Konqueror windows open up in a separate process or they would crash X. It seems like problems re-using portions of cached memory.
I would try a different skin or theme or go with a different chat client. Or maybe compile it from source. I have fewer problems with source builds. The packaged builds throw in "too many configure options."