Nothing special, just a couple random ones that had new versions.
After some investigation--the software was fine, but apparently the server computer had restarted for an unknown reason early this morning. The server logs have nothing interesting to say about the matter, so for lack of any other explanation I'm going to blame my cat.
I started the server in the last-saved state and there weren't any issues, but given that this kind of thing (server shutting off unexpectedly while running) has caused chunk corruption in the past, I went ahead and restored the backup from a couple hours earlier, then used LogBlock to redo all changes that happened from the time the backup was taken to the time the server shut off. 1918 changes were reported and it said it successfully redid 1905 of them--not sure if those were duplicate changes, changes that made earlier changes irrelevant, or what. The player files were kept from the latest change, so nobody should've lost anything. That said, N7275, let me know if anything is missing or unexpected in your inventory or with what you were working on early this morning.
I'll keep a closer eye on server in the next couple of days, and hopefully there won't be any further issues.