Station Master Desktop does not work with some radios (notably the G90), but it does work with FlRig so you can use FLRig as a go between.
In FLRig click Config > Setup > Server
Copy the number that's in the xmlrpx port text box (or enter 12345 if empty)
Open Settings in Station Master Desktop and enter 127.0.0.1:12345 (or what ever number you have) into the com port box, select FLRig from the Radio List, and save.
Added bonus: Using this method for the IC-7300 prevents the menu lockout issue.
That's it.
Hope that helps some people.

