Sessions disappearing without cause

[vortexae]

Recently, I noticed that a handful of sessions I'd created and tagged #Daily were no longer listed under the tag #Daily. I couldn't find them under the "All" category either. I tried recreating one of them from memory, and it vanished again within minutes of my having done so.

Today, because I wanted to test the idea that maybe I'd reached a maximum session limit (Under "All", 30 were listed, and that's a weirdly round number), I tried deleting an Auto Save session I didn't need. For a minute after that, "All" said 29 - then it said 30 again, although a new session had not been created.

So I deleted all 15 of the auto save sessions, to see what would happen. When I was done, not only were those Auto Save sessions gone, as expected, but all except one of my User Save sessions had also vanished.

Possibly related, or, if not, issues which exacerbate the problem: Exporting all sessions fails. Exporting a single session works. Attempts to import sessions one at a time fail silently (It says "session imported" but the session is not there.)