IPhoto videos will not play after OSX Lion upgrade

My old iPhoto videos uploaded from my iPod won't open since it's been updated to OSX Lion... but the new videos uploaded since the upgrade could be played! The thumbnail displays the video but when I click it, a grey triangle with an exclamation point inside it shows up!
What do I have to do to be able to play all my other videos?

Option 1
Back Up and try rebuild the library: hold down the command and option (or alt) keys while launching iPhoto. Use the resulting dialogue to rebuild. Choose to Rebuild iPhoto Library Database from automatic backup.
If that fails:
Option 2
Download iPhoto Library Manager and use its rebuild function. This will create a new library based on data in the albumdata.xml file. Not everything will be brought over - no slideshows, books or calendars, for instance - but it should get all your albums and keywords back.
Because this process creates an entirely new library and leaves your old one untouched, it is non-destructive, and if you're not happy with the results you can simply return to your old one. .
Regards
TD

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