Hi ThermalMike!
I did get the problem from the start since I had the software installer (1-2 Weeks ago) but did not notice until a few days ago.
I got a VGA monitor plugged in in a DVI port (adapter) and a VGA monitor plugged in via converter into a HDMI port.
However I don't have the possibility to uninstall and reinstall now, but since I turner off the application, all the buttons still work, so I'm not in a hurry
Thank you for your reply, and have a nice evening!
Best regards, Florian