This is weird. I made an attempt to create an explosion. Then exported it as animated gif. That worked. Then I decided to change a little bit. Now it is no longer possible to create an updated gif, or make a movie or animated png.
The attached file worked once.
I tried to quit Hype and restart. Even restarted my Mac. Didn't work.
explosie.hype.zip (43.1 KB)
Well, I can...
One thing you might want to try: GIF export never finishes - Using Older GIF Export Engine - #2 by jonathan
Please try it twice in row.
I did… 
weird
Did you try to transfer the animation to a new document?
I did, didn't work.
I just tried it again while changing the size of the gif. And magically........
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Perfect!