Here's a pic of the about screen on my M90.
I have formatted the flash. It didn't remove the book I was reading at that point, but after I shut the unit off and turned it back on it was gone.
I'll have to reboot my iMac later (I'm streaming Dateline NBC right now
)so I can boot into 32-bit and reload a book or two. Then I'll report back if things have improved.
Thanks!