I have an iMac and a MacBook Pro and i have noticed the problem for awhile, although I haven't been able to solve it. On my photo stream I am able to see the photos that are uploaded onto my Mac Book Pro, although I am not able to see any of the photos from my iMac. I have confirmed that Photo Sharing is set to on for both computers and on all my devices. I am having a hard time to find other forums that discuss this specific issue. Thank in advance for any advice. Thanks!