"Did you select the "Microbit RRCMicro" in your Com-selection? "
Yes, this is the driver that was loaded and selected in the profile for RRC-Micro when I installed 1.3.1. I just installed 1.3.1 again and opened the profile, updated it from the 1.2.1 settings to make sure that I had done it correctly the first time. TRX-Manager failed again just like it did the first time I installed 1.3.1. The first message I get is a Windows message which said essentially that TRX-Manager had stopped working and Windows would check for a solution and notify me when it found one. If I continue to try to start TRX-Manager, I eventually get the message about Com port 0 (zero) as I indicated earlier. Also, as I indicated, HRD works but very sluggishly taking about 30 seconds when it starts up to read the radio and adjust all the sliders to the proper settings.
"Did you remember to select the old Com port driver then?"
Yes, I had deleted the new drivers and 1.3.1 program prior to going back and re-installing 1.2.1. As I said, when I went back to 1.2.1 it worked properly as it had when I used it prior to installing 1.3.1.
Joe W4WT
Update: I just installed RRC-Micro and TRX-Manager on a different laptop. Neither program has ever been installed on this laptop so it was a clean install for both products. I set up "Micro" profiles for TRX-Manager and HRD. I started up "Micro" with the TRX-Manager profile, clicked "Connect" and it connected to my remote RRC-1258 with no problem. I then started up TRX-Manager and experienced exactly the same error condition I did on the original laptop after setting the Com port in TRX-Manager to Com 3 and the transceiver to the Icom Pro III. I have Com 3 mapped to Com 0 in the TRX-Manager profile of "Micro".
Joe W4WT