Hi Jon and Keith,
I wonder if you have come across this, but I have found that with W10 if you set the logon mode to Start Screen anything in HKCU run and either all users and current users Startup will not execute at logon - you have display fusion in HKCU run. Since I run CSM I though that setting logon mode to Start Screen would be more useful if you actually needed to use Start but these were the result. Items in HKLM run seem to execute though. Obviously things can change but it may be useful for you to know.
Pete