I also experienced several WSJTX (v2.2.2) crashes during the RTTY RU contest. I was using FT4 via N1MM. I had to reboot the PC each time. Below are screenshots of the error messages I got in the order I got them.
I also had the problem where WSJTX would not log my sent exchange. I had to manually enter it on all FT4 QSOS.
