I didn't see a solution for this topic.
I have tried using PSTRotator and DXSuite-DXView to control my rotor using COM port 1 which is a DB9 on the back of the computer, the radio is an IC7300 plugged in using the USB cable.
If I bring up the rotor program and command it to move the rotor WSJT-X will crash asking me to reconnect which I cannot.
The only way I can get WSJT-X to connect to the radio again is to reboot the computer.
Killing the offending program doesn't help.