Hey @Christopher_Gold - we identified the underlying issue and rolled out a fix yesterday, so you should be able to load up your apps as expected. 
It's possible that a new save was created while the app was in a broken state, though, so you may need to go back in the app's history a few steps. If you're interested, you can see a more thorough explanation of what went wrong over here.
Let us know if you have any additional questions or need assistance with anything!