https://bugs.winehq.org/show_bug.cgi?id=40280
--- Comment #7 from Sebastian Lackner sebastian@fds-team.de --- (In reply to S M from comment #6)
Ah, that's great! Thanks for taking the time to check it out!
I just built wine using the code from around 14 hours ago and tried running mirc, and the results are same as what you said: mIRC does not work, but the crash is not reproduced either...
Turns out that clearing out the .wine folder fully and having wine recreate them fixed the crash.
I still have the backup of the one that was causing the crash if needed.
Else, what to do regarding this?
Well, it might be possible that this bug was present in the wine-1.9.5 tag, but has been fixed in the meantime. You could try to compile an old version and compare the results. Another theory would be that it makes a difference if you build a 32-bit version of Wine, or a full wow64 (combined 32 and 64-bit build) like shipped by your distribution. In some cases differences could also be caused by different compiler versions or optimizations.