There still exists issues with DXVA and ATI drivers. As I have mentioned before I am using two Sapphire HD 5850 Toxic GPUs in crossfire. I cannot upgrade the ATI drivers above 10.9 becasue the screen will flash to black for seconds every time the DXVA turns on and report a GPU driver error.
With version 10.9 DVDfab works fine on Blu-ray but whenever DXVA turns "off or on" my second display screen will flash. This is a powerful computer with 6 cores and highend harware running Windows 7. With the other issues that DVDfab has had with graphics cards and software, someone should look into these issues.