I can confirm that - adding the user to the USERS group works fine.  I'm trying to find out what it is I need to do (unlock/allow) so that I...

Thanks for the advice.  I've checked it out, but it all seems like stuff I have already tried.

I am seeing this error in the SQLAgent Error log:

[241] Startup error: Unable...

I've got this same problem, however, due to a hardening of the SQL Server, I require the user to be part of the Guests group.  Everything (including SQLServer) is running...