Export to MP4 stopped working today
I have been exporting to MP4 from Character Animator for weeks.
Today, I go through the same steps I always have, and this window never changes:

When it claims it is done exporting, the thumbnail looks like this:

When I double-click it, it is a black, one-second video.
I haven't changed any settings in Character Animator since yesterday.
Any idea what has happened?
Thanks!
