After I switched to Devices then deploy, VS2015 gave me the error message:
1>Error : DEP6400 : Failed to deploy. Make sure another deployment or debugging session is not in progress for the same emulator or device from a different instance of Visual Studio: Error writing file '%FOLDERID_SharedData%\PhoneTools\11.0\Debugger\bin\RemoteDebugger\msvsmon.exe'. Error 0x80070003: The system cannot find the path specified.
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