I started using Atom just recently. Today discovered that several files across the project lost changes from the day before. I’m sure it is not a problem of unsaved files (I have a pretty good habit of saving before I move my hands out of keyboard).
It looks like files just went back in their undo history (but I can’t redo them back). The thing making me suspect undo is that about that time I got upgraded Atom to 1.0.12 and one of the changes was about “persistent undo history”. Before I discovered the loss, Atom upgraded to 1.0.14.
Atom was used on Windows 7 (64 bit). The changes was lost after I reboot’ed computer (nicely with OS reboot). Another thing I was doing that could possibly trigger the problem like this is that I opened in Atom as a project a parent folder to my main project (to make a broader file search).