I purchased Aerofly RC-9 a couple of weeks ago and it has been running fine on my 2017 iMac with Big Sur OS, controlling it with a Spektrum DX5e RC controller with the USB dongle I used on a prior version of the software that I had for some time, but had to upgrade to RC-9 when I upgraded the iMac OS. Today when I went to use it the program does not accept any control inputs from my TX but all else appears normal, i.e., loading of aircraft or scenery & getting smoke to appear, etc. I have restarted the computer and tried to recalibrate the controller, but again it doesn't respond to any stick settings or movements. Any suggestions or ideas as to the cause of this problem after initially working without any problems?