My iphone and ipad photostreams and all shared streams synchronize as expected. However on my pc icloud only the shared streams are operational. Photostream does not receive or upload any photos. I have deleted and downloaded icloud. I have followed other's advice to delete specific pc "processes" and restart icloud with out photostream function restoration. My pc photostream worked until I shifted from iphone 4 to 5. I don't think that has to do with up to date ios as the iphone and ipad photostream and shared stream functions are flawless.. Any ideas?