I am also running TrackIR4 with the latest software, so I think, this is not causing the problems…
I noticed some delay when launching the software since a few weeks but most of the time, it continues to work or I reboot the PC. In my case, the boot order is important: TM Hotas, then TrackIR, then FSUIPC , MPanel, Steam,…
You wrote, it wasn´t listed (under controls in MSFS I assume), so you rebooted (whole PC?) and the TrackIR App wasn´t working - so it was without a running MSFS…that narrows the troubleshooting a lot!
I am not a fan of:“Uninstall and Reset your PC, or Windows etc” so I´d go 3 ways:
1st try it without a virus scanner - if you feel saver, disconnect internet first. Some scanner might trouble the software.
2nd check the cabels: the usb cable at this device is very sensitive and doesn´t like tension etc…might be a short circuit. btw: check if the tracker has moved! mine was scanning the sky once since one of my cats moved it once…
3rd try a different usb port or unplug other devices that you don´t need like printer, etc maybe the current is too low.
Last but not least: If the TrackIR software was frozen, I´d bet it´s software related: Try a different PC if possible so you can sort the other points out…
Good luck
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