Are you rendering on only one machine locally? Or using Team Render?
Only one machine locally, I hadn't added the corona camera tag to the camera before. After adding camera tag, the first 90 frames went well, but after that the distortions started again. In some frames it is completely black and in some frames only certain parts of the scene are visible.
Also, why use Corona 4 demo? If you are on the free trial, be as well using Corona 5 :)
i tried the new version in cinema 4d r20 but i wanted to give the previous version a chance because i got random crash errors in corona 5
note: unfortunately I couldn't find a solution for the crash problems in corona 4 either. I get the corona_release.dll error when I try to assign a new material or try to replace an existing material after playing with objects on my scene for a while. I will open a different topic for this problem