Sorry, but no. I changed the refresh rate for the resolution in which DirectRT is running and even tested various resolutions with various refresh rates in both Windows and DirectRT, only after this I rememberd that there was something. It's an old and well known bug that shouldn't be a problem any more in recent systems with recentd rivers and an updated System. But if you have old Lab Pcs with old Windows Versions - like we do - and encounter this problem, download the above mentioned program. It sets the appropriate refresh rate for all possible resolutions.

Henrik