getting this error "Lyrics detected but ...

I have added lyrics to loads of songs fine, but however I get this on a few,

"Lyrics detected but unable to retrieve"

I have checked in iTunes that the lyrics are their, in text with nothing unusual on. I click the lyrics on the iPod Nano (4G) and iPod touch 1G and get the spinny wheel but then get the error "Lyrics detected but unable to retrieve" I can view them on the get info page in iTunes though

Can anyone help please this is really annoying, I have the latest iTunes and iPod software on

cheers

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