Hi, using Browse > Revert freezes Glyphs Mini beta 2.1.4 (102),
bug is also present in previous version.
In attached video, at 25seconds (exactly in the middle), I click Close to try to close the app, there I get the Beachball of Death 
onwards, but the video shows the regular OSX mouse pointer.
recorded video:
revert.mp4.zip (598.3 KB)
6 MB GIF:
EDIT: Sorry, don’t know why GIF is so small, so attached screenshot:
