Amirc 3.5.25 crashes here too! But it has a strange behaviour: if it crashes it does it when I launch it and it connectes to the server; sometimes as soon it connects to the server I have a 'meditation appliccation'. But If this not happens at startup I will have it running for hours and days... It rocks.
But, I repeat sometimes it happens that as soon I launch it and it reach connection with the server it freezes. However often I can remove it and launch again.
I fear it depens on some mui classes, because I have same problem with IBrowse 2.3 too.