Hello everyone,

Recently I have some lighting problems with Aerosoft CRJ 900, the nav and beacon lights illuminate some unusual  white and some other mixed colors squares on ground. I realized that after the second flight with this a/c, in the first flight I didn't notice that (maybe cuz it was day). 

I have to mention that I never had problems with any aerosoft product, and at the first flight the plane was looking normal.

I didn't change any setting tho, I just saw that today (some night flying)

What could cause that to happen?

It's most likely something on your setup else everybody else would be reporting the same.  It could be an effects problem.  Reinstalling could be a solution.  If you can, please post a photo of the problem.  Also suggest searching the Aerosoft CRJ forum.