Yeah, looks like im seeing the same or similar issue.
Kstars 3.3.7 crashes on connecting with indi since I upgraded from 3.3.6.
Kstars log has no output of value indicating the issue, all I have are entries in Windows event viewer that show something related to QtWidgets.dll.
Wonder if this might be a compiler platform issue, half tempted to use the QtWidgets. dll from 3.3.6.