Hi, My setup is: * Matrox Parthelia 128 MB * 2 x LCD Samsumg 21'' DVI (both connected via DVI) - UXGA resolution * Windows 2003 When using windows graphics, etc. everything works fine on both monitors. When I playing video on secondary monitor, it's playing smoothly. But when I playing the same video on the primary monitor it's not smoot, i.e. like "jumping" or "breaking". Any ideas? 10x in advance.