[tomsem]

Well, I fixed it.

First, I tried deleting some items from my Library (expired Borrows, crap I got for free and didn't want in there anymore). It made no difference: I still could not see items purchased prior to a particular book I bought in 2010. All that happened is that deleted items purchased after that date no longer showed up. So now I saw even fewer items!

So I did a Reset, after creating a new collection consisting of the 90 or so items I had on the device, so I could restore them (or some subset thereof) more easily afterwards.

After going through First Use, wifi setup, re-registering etc., my entire library shows up as expected. A bit of a pain but it did not seem that anything short of that was going to work.

I don't think unregistering and reregistering alone would have worked, since doing that doesn't wipe any local data. But I did not try that.

It is taking awhile to index everything, perhaps a minute or two each.