Simulator segfaults in TT_New_Context() on start since version 4.2.1

Since SDK 4.2.1, and up until the recent 7.4.1, the simulator segfaults on start. I do have a stacktrace, but I suspect that the stacktrace is preventing my message from being posted, so now I try without.

Last "working" version was 4.17

However, even version 4.1.7 brings up a blank window with just the menu bar, and no obvious way to load an app. The main part of the window is empty, not even an outline of a device is shown. Any .prg file specified on the command line is just ignored.

Any ideas on how to get this working? Maybe I need to install some
specific truetype fonts? If so, which one?

Thanks,

Alain