Genius 4010 Error
This Apple forums discussion post describes an error that many iTunes 8 users are getting:
“iTunes 8.0 gathers data about my music library well enough and sends it to Apple too; but then 10-15 seconds into ‘processing’ by Apple, iTunes stops and reports that ‘Genius results can’t be updated right now. An unknown error occurred (4010)’. I thought it might be overloaded servers and tried several more times in the hope of squeezing my request in between those of everyone else; but that didn’t work; plus if it were a server issue I’d expect to see postings here from others with the same problems, and I’m not.”
Several posters have tried removing dead tracks–tracks whose files cannot be located as designated with the encircled exclamation point–from the library using the script Super Remove Dead Tracks and trying again, and although this didn’t work for everybody, several posters did get things working correctly afterwards.

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