I receive error "Unable to modify group status to 'True' -2147220992" when I 'Start Logging'. But I can log with the Test Run.

I can log fine with the Test Run. But when I attempt to Start Logging using the service I get the follow error.
DataLinkDAL Execute Exception: Unable to modify group status to 'True'. Error '-2147220992'.
What is the difference?
How can I fix this error?

There is a difference between Test Run and Start Logging. Test Run uses the user account that is currently logged in and Start Logging uses the Data Logger Service, which uses the System account.

These errors occur because the System account does not have sufficient privileges. You will need to configure your DCOM according to our online tutorial.

Software Toolbox DCOM Tutorial

At a MINIMUM, you will need to add System and Interactive and give them both full control.