Tremor annoying letters (1 Viewer)

[danb]

Hi, When I am with any menu, the letters that can move horizontally, they flicker when they are not selected. I am using PureVision HD 3.1 with Mediaportal 1.1.0 in Windows 7 x86.
I have tryed to change the horizontal desplacement speed but unsuccessfully.

What solution do you have?

Thanks