First for a video part, that I use as a reverse part, which do not contain an audio track.
It worked after I selected “No audio” in the advanced export window…
Second, I have for my new video I have five video tracks and two audio tracks.
And at the end, where the export had stopped, I had the second video track empty. Is meaning first video track with files, second empty, third again with files.
And it stopped somewhere around where this part starts as described…
As I moved the files, that there is no empty video track at that part, the export worked fine.