What makes you believe it was Start10 as the cause?
Booted up, got a black screen. Checked task manager and explorer wasn't running. Tried to run explorer.exe, it started briefly then crashed. Stopped Start10 in the process list, started explorer again and it worked. Rebooted, needed the same sequence to get a desktop. Uninstalled Start10 and not had a problem since.
Plus this in the event log points to Start10
Faulting application name: Explorer.EXE, version: 10.0.19041.1151, time stamp: 0x2885d2b8
Faulting module name: Start10_64.dll, version: 1.9.7.0, time stamp: 0x60c79978
Exception code: 0xc0000409
Fault offset: 0x00000000000f971f
Faulting process ID: 0x1234
Faulting application start time: 0x01d7a26b94eecfa9
Faulting application path: C:\Windows\Explorer.EXE
Faulting module path: C:\Program Files (x86)\Stardock\Start10\Start10_64.dll
Hope that's useful
Mike