Hello islander79,
You may need to sign out of iCloud in the iCloud Control Panel, then sign back in.
I upgraded from iCloud Control Panel 2.x to 3.0 and the thumbnail images under Recent Updates for my shared streams don’t appear.
Try signing out of and back in to iCloud Control Panel:
- Close any open Windows Explorer or File Explorer windows you're using to access iCloud Photos (or Photo Stream).
- Open iCloud Control Panel:
- In Windows 8, go to the Start screen, then click the iCloud tile.
- In Windows 7, choose Start menu > All Programs > iCloud > iCloud.
- Click Sign out.
- Enter your Apple ID and password. Click Sign in.
- Select iCloud Photos (or Photo Stream) under Favorites in a folder window of File Explorer (Windows 8) or Windows Explorer (Windows 7).
iCloud: Troubleshooting iCloud Photo Sharing and Shared Photo Streams
http://support.apple.com/kb/TS4379
Cheers,
Allen