I run AmIRC 3.5.25 (which apparently some people claim to be very buggy) and I mostly have three AmIRC's up (three different servers) on my Pegasos, which is on almost 24/7. Cant recall it's ever crashed on my Peg for the couple of months I've had it, and not on my A4000 PPC either, that I can remember.

Since I'm not sure which MUI classes are used by AmIRC and someone wanted me to post versions I have made two textfiles and put on my home page. One for the ones coming with MorphOS and one for the third party ones:

http://blackeagle.mine.nu/anders/peg/mui_classes.txt
http://blackeagle.mine.nu/anders/peg/mui_classes_3rdparty.txt