I had a patron come inside today with a weird problem with her Kindle Fire. She'd tried to download a book, and it wouldn't show up on her Fire.
I walked myself through it, but nothing I tried worked. Turning off the wifi, syncing the Fire, nothing. No matter what I did, the book sat in the 'pending delivery' part of the 'manage your kindle' section.
I had to hand it over to my co-worker, who works with Overdrive much more than I, but even he couldn't figure it out. Seems like an e-mail to Overdrive is in order if our searches come up empty.