After having done a "Force quit" for iPhoto (it wouldn't quit after I had worked on some albums, deleting photos etc.) I now have a bunch of empty thumbnails for the photos I deleted/emptied iPhoto's trash. I've tried all the rebuild options available (holding down ALT and CMD while starting iPhoto gives various rebuild options) but this hasn't solved my problem. I'm still unable to delete all those empty thumbnails representing the photos I deleted. If I select those empty thumbnails (they all have a generic "dotted-line frame"), delete them (ALT, CMD and BACKSPACE) and finally empty iPhoto's trash (right-click on the trashcan icon) and try to quit then iPhoto just hangs indefinitely. So once again I have to perform a "Force quit". How do I fix my iPhoto library? I'm using iPhoto '09 (version 8.1.2) on OSX 10.6.8.