I could finally again play with the telescope last night. (sbig st8xme). I restarted with a fresh installation on 64bit system.
When I did the autofocus routine, he asked "Does SBIG has an mechanical or electronic shutter?".
I replied: "yes" (ST8 has mechanical shutter).
Then I only got black frames during the focus routine. I could not set it back again to normal.
What is the purpose of this function? Is it a bug?
Also, on the scheduler, when I add an object to the scheduler, and I click "play", then the status only changes to "scheduled", and he doesn't do anything further.