https://bugs.winehq.org/show_bug.cgi?id=52131
--- Comment #17 from Eric eric.wheez@gmail.com --- Also, regarding my observation above: "If I replace OJ02UX with a different gridsquare (so that it looks like: 9W2RUT|DN06UB|7093|41|00-23|PUBLIC), then the crash is also averted."
Tracing the PropagationPrediction namespace, it appears that if I put my own gridquare in there to calculate prediction for, RMS Express appears to ignore the calculation of prediction, so that might be why I was able to avoid the crash by doing that in that case.