Animate can not create SWF movie file

This happened out of nowhere!?
I want to export the animation as video and Animate needs to create a SWF in advance, but can't. 😞
I was able to do this several times, but now Animate fails. I tried a restart but it keeps failing. The path is short, the file is writeable etc.
Any help available?
Maybe a log file that might help to find the source of this issue?
Thx
