Files disappearing while I'm working on them?

Since I updated to CC, I've noticed files deleting themselves while I'm in the middle of editing a batch. The jpg preview will still be there, and I can tell from the positions of the sliders in my grayed-out toolbars that my edits are still there, but the image says "File not found" at the top. When I click the exclamation point, I see the popup attached, and when I go to the folder it describes, the photo is, in fact, gone. These files still exist on my SD card, so hasn't been a total disaster so far, but what's going on? This feels like it might not be a Lightroom problem, but it started immediately after this update, and I'm *really* hoping this doesn't mean something important and expensive is corrupted.


Any thoughts you have would be appreciated!