Crash on startup - at IeBrowserEmulation.Register

[mattr]

New Win10 install, built-in .Net 4

mRemoteNG doesn't start (tried installed and portable version)

This is in the Event Viewer Application log each time I try and start it.
Does anyone know what this is?

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Application: mRemoteNG.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.NullReferenceException
at mRemoteNG.Tools.IeBrowserEmulation.Register()
at mRemoteNG.App.Startup.InitializeProgram()
at mRemoteNG.App.ProgramRoot.StartApplication()
at mRemoteNG.App.ProgramRoot.Main(System.String[])
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