Interestingly enough I have had this happen on a local test account today. My MSA account was not affected by this issue. The App would start and instantly shutdown. I have seen this type of bug with other apps before so I was not surprised. I restored the old win32 app. These type of XAML bugs seem to be the biggest problem in Windows 10 right now. It generally doesn't feel as solid as win32 and might need another year for MS to fix up. Not everyone needs XAML apps .. however I have seen integral parts of the system like the login XAML app also suffer from bugs (Still not patched).