Selected photos do not have highlight box

Question

I am having difficulty with iPhoto 11 on a Mac Mini in 10.7.2 Lion. This problem has been around since day 1 with this computer (late July)
When I select photos it displays in the top right of iPhoto "x photos selected", it however does not surround the picture with the yellow highlight box. As soon as I either scroll the window down and back up, or click on the scroll bar the yellow highlight box appears.
If I have photos highlighted without the box, I can still move/delete/etc the photos that are selected, but it is quite inconvenient not being able to see the yellow highlight box around which photos I have selected.
I have tried deleting the preferences, copied over a different copy of iPhoto from another Mac, performed all software updates, and have looked through the preferences in the application for anything that might be causing this.
Any help would be greatly appreciated, thanks!

Answer 1

Make a temporary, backup copy (if you don't already have a backup copy) of the library and try the following:
1 - delete the iPhoto preference file, com.apple.iPhoto.plist, that resides in your
     User/Home()/Library/ Preferences folder.
2 - delete iPhoto's cache file, Cache.db, that is located in your
     User/Home()/Library/Caches/com.apple.iPhoto folder. 
Click to view full size
3 - launch iPhoto and try again.
NOTE: If you're moved your library from its default location in your Home/Pictures folder you will have to point iPhoto to its new location when you next open iPhoto by holding down the Option key when launching iPhoto.  You'll also have to reset the iPhoto's various preferences.
OT