Hi, in the meantime I found that removing one RAF file and the corresponding XMP has fixed my problem. I am able to re-import the RAF file into a separate collection and use it without issues. But when I import the RAF file with the XMP file into another separate collection darktable crashes again.
Darktable should take more care in handling its input data. If data (in the XMP file?) is broken, darktable should discard the invalid input data. Anyhow, no kind of input data should lead darktable to a segmentation fault ("Speicherzugriffsfehler"). I am attaching the XMP file. Cheers Michael
DSCF8970.RAF.xmp
Description: XML document