OS X 10.7.1
xchat aqua 0.16.0
It started crashing a few days ago when sending certain messages. I have confirmed that if I say "k", "kk", or "no" (exactly those without additional text) then xchat will crash. Very weird bug. I tried deleting everything and reinstalling, didn't help.
The crashes happen every time, not sporadically.
I didn't change anything a few days ago. The crashes just started for no apparent reason. I think there was an OS X security update around then.
Using quakenet and accessirc networks. same crash on both, so presumably not server related.