I've got it now.  I had cleared the cache &history several times the past few days.  I did it AGAIN, and then it occurred to me it was the only thing that I had bumped from my cart to the wishlist, right after the nixed site update.  So with an empty cart I added it from the wishlist, the site told me it was already in my cart and put it there.  I was able to check out after that.

Perhaps some odd glitch created after the update that didn't occur.

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo