Adobe After Effects Black Screen

Hi!

I know there is a conversation about this, but none of the solutions helped me yet.

I have permament black screen in Adobe After Effects, no matter what I do, tried to Purge the disk, reinstall, nearly everything but the black screen keeps punishing me.

I want to mention that the black screen not showing always. It's like videodependent, cuz I want to edit a video, I get a black screen, but if I import another video, I don't see black screen.I thought that it's something with the Composition settings that the resolution if smaller then the imported video's resolution, but I was wrong.

Thank you guys for helping me.