I did an upgrade from Windows 8.1 to Windows 10. Everything went fine and was able to access everything. Then, yesterday afternoon, the Start Menu no longer functions. Also, the Modern app thumbnails have disappeared from the desktop task bar. There is a blank placeholder for them, but clicking on them does nothing. I'm able to get to the Settings menu by right clicking on the desktop, choosing Personalize, then clicking on the back arrow. I thought an update would fix it; however it says my device is up to date. I can't be the only one experiencing this? Funny thing is, I can get Cortana to work, however it crashes when I tell it to open a Modern app. For example, "Open Store". Runtime Error! C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support tema for more information.