Closing the loop on my problem. After looking over the latest thread from Bob J. ?and my "Fatal Error" message, it seemed the trouble was with the WiThrottle Preferences. So I deleted these files:
WiThrottlePreferences.xml
WiThrottlePreferences.xml.bak
Started up DecodrePro and everything worked just like it did before I upgraded to Catalina. Started the WiThrottle Server and got out the iPhone and started up WiThrottle - ran perfectly.
All good!
Thanks for all the help.
Fran G.
