I just hit the worst kind of bug.  I was trying to undo a hyperlink I’d inserted into a post, so I hit undo.  Nothing happens so I hit it a few more times and suddenly the formatting gets all weird.  I then notice that half of my first paragraph has vanished, but the autosave kicked in just at that moment so the content is GONE.  It wasn’t a massive loss, but this sort of thing is why I stopped using the online editor.

So rare that I can’t replicate it (which renders any bug reporting pointless), but so annoying and destructive that I no longer trust the editor at all.  It’s a shame too, because I still haven’t found anything I like better.