An error started occurring last week where Animate has stopped playing test movies on newly created files. It has been about 3 months since using Animate last (with no issues), for what that's worth.
When I try to play the test movie (Command+Option+Return or using the menu bar: Control>TestMovie>In Animate):
1.The usual progress bar saying "Exporting SWF Movie" appears.
2. Then a new window opens, which usually plays the test movie. Instead, the window is all white. No sounds or images play. It will stay open as long as you let it.
3. Upon closing it, the error window appears (see attached file).
Any older files created prior to last week can still play their test movies fine. But for any new file, no luck.
I was using version 2019 or 2020, I forget (it was still the Orange logo). I thought perhaps I needed to update my version of Animate, so I installed the updated version (and selected "remove older versions"). However, this problem persists even with the latest version. On average I make <1minute animations so they're not huge projects.
My projects are almost always just .pngs and an .aif sound file, 1920x1080. Frame rate 24.00 and Action Script 3.0. I'm not building my files any differently than before.
Last, I'll also note that the Animate icon on my dock is tiny (see attachment)! So, overall weirdness going on.