This may be an App Store issue, but out of curiosity were your cities backed up on App Store and/or Facebook before updating or uninstalling? If so, have you clicked the tools or settings icon and reconnected to the App Store and or FB, whichever you used before? Just an idea while your waiting for a response from support.
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My city is backed up to Facebook.
However, the app got stuck during starting and downloading some data.
Reinstalling doesn’t do anything, apart from the game claiming it has no internet connection and eventually getting stuck again downloading stuff
