On the original post answering is disabled, so I opend this one (2):
Check, if the picture file, adressed in
settings, rig control, misc. QSL Card Image
still exists!
If the file doesn't exists any more, e.g. because you did erased the file, VarAC will end immediately.
Select a new file location and everything works well.
73, Lutz, DH7LK