I think i ran in this (very bad) issue a couple of times but unfortunately wasn't able to reproduce it on a screencast (it doesn't seem to be systematic, maybe it's coupled to the timing of events). Each of those times I was writing a paragraph sentence at the end of a paragraph and then used the down arrow to move the cursor to the next paragraph (or title of the following section). This caused the last few words that were typed to simply disappear completely :scream: (and cmd-Z doesn't bring them back).