I've had it happen using PP2010 on an airplane w/o a connection, obviously.  IIRC if you click on the 'OK' button in the  Library pane when I get the error it will proceed and function normally... I just tried it with my network card disabled and it is indeed the case.  This is the 32-bit PP2010 with the internal library...

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The Wisdom of bagginsbill:

"Oh - the manual says that? I have never read the manual - this must be why."
“I could buy better software, but then I'd have to be an artist and what's the point of that?"
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