I just did another test with another optical train. The problem remains.
Calibration is not possible.
Then I installed PHD2 and the calibration also fails with PHD2.
I have now checked the mechanics of my mount. But I do not see any errors. There is no play and everything is fine with the belts.

I don't know what to do and it's a bit frustrating.
Everything was working 3 weeks ago with the exact same setup and the only thing I've done since is install the latest stable ppa.

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