Since the iCloud beta, my iOS devices refused to upload to the server. After the web version went live, I was forever stuck at "Preparing Library." (about 2 months) After working with Apple support, this is what happened. 1: Create a test iCloud account. 2: Sign out of iCloud on your iOS device, sign into the new account 3: Check and see if your photos upload and the web site displays them. 4: Contact Apple support 5: You'll quickly get escalated to the next level. Most likely, they will ask you to reset your iPhone. If steps 1-3 worked for you, tell them what you did. 6: What ended up solving the problem for me was having Apple Engineering reboot my iCloud photo Library. Hopefully, if you are having the same problems as I did, this will help you get through Apple support quickly.