As already mentioned in the reply mail, i have tried reducing the number of connected USB devices. Cutting it down to only the Tobii device, though, makes little sense. I kind of prefer to still have keyboard and mouse and for the game i play, i need the powered USB hub to power the joystick. (I use a X-56 HOTAS, which is a bit power hungry and is unreliable when being plugged directly to the PC. )
That being said, just today i had the same effect as described above, with the new version 2.6.0. For a few days i did not see that effect, but by being a sporadic problem which doesn’t always happen, this is no indication of improvement. Fact is, it still happens. 🙁