Okay, ten months later, I finally upgraded to your latest release, namely, v.23.0.91 (64-bit). Not only are animated gifs not being imported as video media types (which is fine... maybe you changed your mind about that feature), but worse, I can't view them at all. I just get a black display. (They play fine in various other image viewers including Windows' default Photo viewer.)
Thumbnails are created just fine, so it's not like MC is having trouble reading the file; it just won't play (or display) them. It doesn't matter if I set the media type to 'Video' or leave it as 'Image'.
Is this a known issue?
ETA: Also, the same files at least display the first image frame in my older MC (v.20.0.132). They don't animate, but that was the reason for this thread in the first place, so we already knew that.