Hi @harro, you can follow the guide below on removing all traces which might be worth investigating @ https://help.tobii.com/hc/en-us/articles/115004526774-Installation-or-setup-issues
Also, can you confirm there are no fullscreen applications running either in the background or on another screen? This might be causing the issue. Unfortunately, we cannot currently reproduce the problem in house, so will continue to investigate other possible causes.