iPhoto Album Covers Problem

Hey all,

I did a clean install of Snow Leopard after backing up my iPhoto library. I simply copied and pasted the "iPhoto Library" into my Pictures folder, and I thought everything went well.

I opened iPhoto today, and my pictures are all there. However, there are no album covers and I cna only SEE a picture if I click on it from within an album and see the large version. In other words, no thumbnails exist in iPhoto, even though all the pictures are there.

I still have my backup, but I'm thinking this is just a setting in iPhoto. I think this because I've added more photos and the same thing is happening.

Please help.