Run button in UiFlow Windows Desktop IDE working intermittently?

  • I am trying to learn UiFlow from Luke's video's on UiFlow for beginners. I have a M5Stack fire. It is running V1.6.4 firmware
    The Fire is connected via USB to my Windows 10 PC. The PC is running Desktop UiFlow IDE version 1.6.4.
    The problem I am having is that when I use the "run" button it works perhaps 1 time out of ten.
    It is very intermittent.
    Is there a procedure for using the "run" button?
    What is the procedure if using the M5Stack fire device?
    Any help appreciated.