This is truly weird. I have the PB 2017 version of my app out for beta testing, and one user reports that when he opens a certain window (or another one inherited from it) the app crashes with no message. No other user (or any of our test computers) shows this behaviour, and it has certainly never been reported with with PB12.5 version that is used by thousands of users.
I have checked that the user's install isn't damaged, by running checksums on all of the installed files. He's on Windows 10.
Anyone have any bright ideas on how to go about resolving the problem for this user, other than telling him to run it on a different computer or revert to the PB 12.5 version? It occurs to me I could add log file messaging for him just before opening the window and at multiple places through its Open and ue_postopen events to at least see where it's happening, but that would certainly be a pain to do.