HT4906 How can I get Photo Stream to work in iPhoto on my iMac?

Question

Photo Stream folder acts as if it has never been used. Yellow box shows directions on how to get started. Even though I have had it working successfully in the past, I tried each of the methods. No luck.
I have gone through the process of verifying that photo stream is turned on properly on all devices (iPhone 5, iPad (original), and iMac (2011). If I download from my camera, all pictures show up on iPhone and iPad, but not in Photo Stream folder on iMac iPhoto. The date after the title "Photo Stream" shows December 5, 2011. (That's probably when I started using this iMac).

Answer 1

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 (Snow Leopard and Earlier).
or with Mt. Lion from the User/Library/Containers/com.apple.iPhoto/
Data/Library/Caches/com.apple.iPhoto folder
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.
NOTE 2:  In Lion and Mountain Lion the Library folder is now invisible. To make it permanently visible enter the following in the Terminal application window: chflags nohidden ~/Library and hit the Enter button - 10.7: Un-hide the User Library folder.
Then check the iPhoto/Photo Stream preference pane to make sure the necessary checkboxes are checked.