It seems to me like we’re talking of two different problems here by now.
1. COLD_ZA seems to have a problem with the device starting or being recognized, which required to delete the calibration settings from the registry to fix things.
2. I still suffer from the initially described problem that at one of like three or four times of booting my computer, the device is not being recognized. Rebooting another time usually fixes the problem, but nothing short of that can solve the issue now. At the initial posting i described a method to kill the software and restart things, so the device would work without a reboot being needed. That procedure is not working any more, if the device now fails at startup, nothing but a reboot seems to help.
If i understood that of COLD_ZA wrong and it’s actually the same problem, please correct me.