Heh... might've known I shouldn't visit this thread. Or if I do, I shouldn't post something about having no more problems. Yesterday's page of notes just got overwritten by a different item. Fortunately I can pretty much remember what they said, but I need to set aside time today to check all the other items I edited yesterday, see if they still have their original contents. Cross your fingers for me.
Tip for minimising damage: keep your item text short. Subdivide long items into several smaller ones. Yes, it takes a long time to switch focus between them, but at least you can't lose so much at once.
I suppose to be absolutely safe I should just never use more than one tab.
