Thank you, Jasem. I wrote an email to zwo support. They say

"It is normal, the gain over 460 is digital gain.
Gain range may differ from software and drivers."

They couldn't tell, if the driver has recently been changed.

From the camera's bahaviour I would say there is no difference between before and after the change, i.e. gain 110 leads to similar images as before.

However, it would be good to have an explanation, why suddenly there is a different maximum gain in the driver … that is not a thing that happenes just like that.

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