Trying to restore iPhoto pictures

I am going to post in the Time Machine and iPhoto forums. I tried to upgrade to the iPhoto 11, and bunch of my photos are now showing up blank with white outlines. I would only say that about half of my photos between July 4th and when I did the upgrade are showing up in this manner.
I went back to iPhoto 9 and tried to restore my iPhoto Library back to the point just before I upgraded. When I go into iPhoto "Browse backup" it still shows the the photos blank with white outlines. Also on the right side of Time Machine there are only white bars until Nov 17th. The bars before then are gray. What does this mean?
Any suggestions on how to recover the corrupt photos?