Peter, this morning I was able to open the .RAF without problems. This time, though, I imported it through the usual darktable dialog. Yesterday, when it crashed, I was right-clicking on the downloaded file, and specifying ‘open with darktable’. Perhaps this is a clue?
Ha! I just tried opening another file, .ORF this time, using the right-click procedure … and it crashed. That file also opens fine via the import dialog. Don’t know if this has anything to do with Marco’s problem.
I’m afraid you’ll need to tell me how to generate a backtrace in WIndows. Now if it was Linux I think I could do that!