Fuze+ microsd card not recognized?

This is driving me crazy: I’ve spent a lot of the past few days cleaning up mp3 tags and importing to a 32GB microSD card, and it worked – yesterday.  Today, somehow the card got corrupted – that’s okay, I figure, I’ll just reformat and copy back.  No such luck: the Fuze+ will NOT recognize the card for the sake of formatting, although it WILL tell me that it’s “Loading card” and then flash briefly what looks like the “Incorrectly formatted” message.  This is the very latest firmware.