Updated my iCloud email address. What a mess it made for iCloud Photos.

It's bad enough that you have to resync your entire iCloud Photos library to OS X. Getting it syncing properly again on an iOS device is a totally different world of frustration. You literally have to purge all photos off an iOS device to enable iCloud Photo Library syncing again which then has to sync the entire library all over again. Apple definitely has more work today in the realm of continuity.