P.S. This is Xojo2017r3 on Windows 7, and here’s a clue for the Xojo team: earlier versions of Xojo that will open this project are 2015 and above, and in those earlier versions of Xojo, this same exact BEX crash happens immediately after the project BOOTS, not when it quits (can’t quit it normally because I can never get it to run).
Also FYI, the project was first written in RB over a decade ago, and has been maintained to work in every next version of RB and Xojo since, although sometimes it would not work in the currently released version and I had to compile with an old version for a while. Why this is happening now and it didn’t happen before, I don’t know.