Hi, follow this instructions below, then you will get rid of the "flash"-problem when looking at 1080p with Beovision 7-40 MarkIII/Beosystem3:
1. Upgrade your TV with sw 4.0 or higher
2. Go into the "picture"-meny when looking at 1080p-source. Turn the "size" parameter to maximum or one step below maximum. This will zoom the picture a little but not much.
Now, you will NOT see any flashes down the screen anymore. It is important that you put the "size" potentiometer in the picture-meny to maximum or 1 step below maximum, otherwise you will se the flashes.
I hope this will solve the problem for ALL of you!
Regards
Martin