One more Information: When ALS is on the sky and horizon appears mostly just dark blue like in the second picture. It does almost not matter whether its day or night. May indicates an overall ALS-Problem?
Screenshot shows daytime
Edit: I was able to solve this problem. But the issue with the cockpit still remains. At day some parts and wordings are missing when setting aircraft model graphics to 3 or above. And at night the cockpit is all white (except missing parts: black).