I'm still having the problem. When the crash dialog comes up, clicking "view details" gives me:
AppName: mirc.exe AppVer: 6.1.5.0 ModName: ws2_32.dll
ModVer: 5.1.2600.1240 Offset: 00003b2c
mIRC continues to work just fine until I either click "Send" or "Don't Send", which causes mIRC to exit.
Since mIRC works fine even while the crash dialog is on the screen, it looks like whatever the problem is, it's happening in an unimportant system call. If it's possible to trace back from this address to the code in mIRC that's executing the DLL code, then maybe it could either be disabled, or maybe the same result could be achieved with a different DLL call or by equivalent application code.
