Fixed it!!!🙂
First make sure you have your machine set up to display hidden files. (Mine was turned off to hide all those darn .DS files so that was job number one).
This link shows how to do it if you need to thru terminal.
https://pixelgrinch.wordpress.com/2014/10/20/mac-os-x-show-hidden-files-in-yosem ite/
Then
1. Close Photos
2. Go to System Preferences, iCloud, Photos and disable “My photo Stream” and “iCloud Photo Sharing”
3. Go to folder /Users/YourUser/Library/Containers/com.apple.cloudphotosd/Data/Library/Applicat ion Support/com.apple.cloudphotosd/services
4. Delete com.apple.photo.icloud.myphotostream and com.apple.photo.icloud.sharedstreams folders
5. Enable “My photo Stream” and “iCloud Photo Sharing” again.
6. Start Photos. After a while, the shared photos will start coming although may take a while.
Last step, go back and hide hidden files, again shown on link above.