Hello Mike,
Thanks again for the help.
I will send the screenshot.
I have not upgraded my monitor, but I have moved the TrackIR a couple of times from left to right ( on top of the monitor )
I have definitely moved my pc, since I put in the new motherboard, a new cpu, new memory and a new graphics card
I was also wondering whether it might be overheating, but it doesn't feel hot, just a little warm.
I'm now also testing with some older software versions. With version 5 beta 05 the software is working, but the TrackIR is not working in games (the blue light does not light up), but with version 5 final B the TrackIR works again in games. I did not have time enough to test it any further, so I will do that again tomorrow.