Switchboard - unable to launch editor

nDisplay issue. Unable to launch the editor from Switchboard. Puzzled as everything was working yesterday.
Steps to reproduce.

Launch Switchboard and Switchboard listener.

Check paths to uproject file and IP address is correct in Settings.

Add Device > Unreal

Enter same IP address as in settings.

Click the connect button

Click the launch arrow.

Get the following errors in my unreal log file

Fatal error!
Unhandled Exception:
EXCEPTION_ACCESS_VIOLATION writing address 0x000000000000002

Crash in runnable thread

Crash in runnable thread TaskGraphThreanable
TaskGraphThreadNP 8TaskGraphThreadNP 3

Crash in runnable thread
Crash in runnable thread TaskGraphThreadNP
1TaskGraphThreadNP 0