Thankyou again for your response. Let me run down my steps to see if there is anything I'm missing. I've deleted the 2 systems I run Discovery on so I can start from scratch.
All; services are on and my range is set at 10 miles. I have Full Data Base checked as well as all my favorites.
Hit Menu then Advanced Menu then Advanced Option.
Hit Discovery Mode Hit Trunking Discovery Mode.
Hit Create New Settings then Select System.
I chose the GCRCN (Greater Cleveland Radio Communications Network) in Full Data Base.
I choose the Cleveland Simulation Site which is what I have done for years.
I name it Cleveland System then hit Accept
All the options are in white and able to be changed except the Start button.
Thanks Again for your help and have a nice weekend!!
Hmm
In theory, set up like that, it should work. But try this & see if it helps:
In Sentinel for the HP-1, access the Profile Editor.
Click on the Discovery tab.

There, you can create your Discovery session, giving it a name, and setting your basic options (logging new or all, compare, duration, etc)
Set up the basics & download to your HP-1. To actually run that session, you'll need to make your system selection on the scanner. Once you've done that, see if Start will work. No idea if that will work for you, but at least it won't "cost" anything other than a few minutes of your time.
Good luck!