tnks for your reply Tom.
In my setup 234+ never flashes, no matter how high or low I set my contrast. Only 230-234 flash. Maybe you can tell me if this is due to my (rare) setup or if something else is wrong:
I use a HTPC with the following settings:
Media Player Classic with madVR as renderer set to 0-255
AMD HD7950 GPU set the RGB Full Range output (0-255)
Sony VPL-VW1000ES projector with HDMI Range set to FULL
What you think of this calibration I did?: