I've run the app and scanned all of the albums on my phone, seemingly successfully. However none of them are showing up in Android's default music player; I see only a default image. I copied the muaic to my phone using Windows Media Player originally, if that makes a difference, and my SD card is encrypted (if that makes a difference too).
It's been at least an hour since I downloaded the album art and so far none of the downloaded images are showing up in the player, even though the grabber app shows them all.
I set the option to auto save to the SD card and have also tried the rescan media thing, none of which has an effect.