@yaqube
What changes did you make for the 50/60Hz switching?
It acts like a PAL and NTSC machine, but some games and demos/intros then show different graphics effects.
e.g. an old cracktro from Blizzard works fine at 50Hz. switsching to 60Hz will "destroy" the objects and scroll text.
switsching back to 50Hz everything is back to normal.
the same is even when booting up at 60Hz and then switsching down to 50Hz. its the mode itself what causes the graphic trouble.
perhaps we can combine our research to find the general problem that also make other games and demos show that graphics problems all the time.
This video filter idea is impressive, looks like a bilinear filter, very useful für large TFT screen

how is it made? please tell us :-)