Quick Time player cannon be opened because of a problem. Check with developer to make sure Quick Time player works with this version of Mac OS X

"Quick Time Player cannot be opened because of a problem"  Futher noted - Check with developer to make sure Quick Time player works with this version of Mac OS X.  The player had been working fine on my iMac 24, even after upgrading to Lion. Now, nothing but this message. This involves Quick TIme Player version 10.0. Could upgrading to the 'Pro' version be worthwhile?  Can't find anything on support that comes close to answering this perplexing situation.
Thanks,

QuickTime Player 10.0, if that's what you have, is indeed too old for Lion which should have QuickTime Player 10.1. Check your system to see if perhaps you have two copies of QuickTime Player, something quite possible if you moved or renamed QuickTime Player before upgrading.
Hope this helps.

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