I tested now and it works fine. It could be one of two things:

1. Check calibration options and make sure light source is set to MANUAL.
2. Perhaps you selected that your camera has a mechanical shutter so it tries to use that and not ask for cover. Unfortunately, there is no easy way to edit this, you need to edit ~/.config/kstarsrc file and look for "ShutterfulCCDs" key and remove your camera from there if that was the case.

Read More...