I did look at each shield graph, and none were showing any significant activity. The graphs were working, because the file shield graph did show a couple of blips here and there when i launched something.

As long as it doesn’t do it again, i’m content to chalk this oddity up to the partial-update state i mentioned in the second post.

If you want more information, i’ll be happy to answer. For one thing, i’m running Windows 7 x64, so i don’t expect it’s the same PerfectDisk/Ghost/Acronis issue as the others are having; in fact, i don’t have any unusual, disk-management programs on here anyway, though Windows itself likes to defrag once in a while (but i didn’t see any mention in the event log of it starting a defrag session at that time).