This thread...
http://www.forum.cncdrive.com/viewtopic.php?f=4&t=378
...is about UCCNC crashing during start, and I mentioned that I have observed UCCNC crashes also. Been told that my problems are not related, so instead of hijacking that thread, I decided to start my own.
It seems that the problem is repeatable. UCCNC will crash every time I start UCCNC and change focus to another window before UCCNC is up and running. This happens when macro "Precompile all macros on startup" is ticked, but everything seems OK if it is not selected. I stated before that I have seen this in 1.2029 as well, but it seems that this was not the case, or at least not repeatable because I could not make it happen in 1.2029 today, but easily repeated in 1.2031. It also doesn't matter which software I switch focus to, have tested with several and it is always the same results, UCCNC is crashing while everything else seems OK. There seems to be a clear relation to macro pre compile option.