Error -50 when trying to sync purchases back to iTunes

I'm a UK iPhone user (no relevance) and tried the iTunes store last night for the first time. I browsed, purchased and downloaded an album without a hitch. A warm feeling all over when things just 'work'. I've come to charge the phone today and it has shown an error for the first time. I can only assume it's when it's trying to copy the purchased music back to iTunes. It shows a window with 'the iTunes Library file cannot be saved. An unknown error occurred (-50)' To confirm, the purchased music does not appear on iTunes.
I powered down the phone - no difference. I repaired permissions on my Powerbook - no difference. I clicked restore in iTunes only to be told that I would have to rePURCHASE my music again! Not redownload. REPURCHASE! How is this fair?!
Has anyone any ideas? I do store my library on an external disc which was the first thing I thought of but I can read and write to it OK.

Nathan - I've plugged into a different socket using my travel cable (that came with the headset) and it is now transferring my music over!! Magic!!
I should have thought of that earlier - I did restart the Mac a few times and still the problem occurred. Ah well - all's well that ends well!!
Turned out to be my USB hub was having an issue since I'd plugged an Apple mouse into it - removed that and the original dock is working perfectly again.
Thanks for the replies guys!

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Check this document: http://support.apple.com/kb/TS3297
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Hi,
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Error -50 when trying to sync purchases back to iTunes

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