Hi Wim,
Yes, I have tried the display properties in every resolution. Now, every setting from 1366x768 to 800x600 is flashing green. It's not black anymore, but every setting flashes green in a different size.

Also, the TV works with my dish network receiver in 1 HDMI input and my PS3 in another HDMI input. I can also use a different computer that has an HDMI output in the same HDMI input I use for the DisplayLink Adapter and it has no problems.