Cut 'n' paste from scanner.log :
[11-01-08 02:54:45.8125] Slim::Music::Artwork:recacheAllArtwork (435) Starting precacheArtwork for 7800 albums
[11-01-08 02:58:07.3314] Image::Scale::new (44) Warning: Image::Scale libjpeg error: Corrupt JPEG data: 908 extraneous bytes before marker 0xf8 ((data))
[11-01-08 02:58:07.3320] Image::Scale::new (44) Warning: Image::Scale libjpeg error: Unsupported marker type 0xf8 ((data))
[11-01-08 03:15:18.2639] Slim::Music::Artwork::__ANON__ (528) precacheArtwork finished in 1232.43439817429

Would like to fix the errors, but need filename in the error log. Not the end of the world, though.

7.6.0 - r31601, XP