Hello alexch, hello 6D users,
merry chrismas!
I have the same issue with my 6D as you mentioned. No working image capturing, no live view in SGP, mirror lookup setting does not change this behavour. Is there a final solution?
My Canon 600D work with SGP without any problems and both cameras (6D and 600D) work with APT Tool on the same computer.
Should I provide a log?
Thomas