I'm not sure but it is possible to change the Comp. working size more than 640/480 ?
I mean not the preview ratio in prefs that I put to free.
But the blue box Comp. on the advanced output window.
I'm working on multi screen (6 x 1024/768 windows).
=>>
The preview mode is probably linked to the Comp size so I can't see really what is the size out on the preview window and I allways give more in the master size out to have the full size on projector

That I need is change the Comp size to 1024/768..
There is a bug too with the INVERT OUTPUT COLOR and OUTPUT ADD COLOR on the Master window. When you work with an output window size more than 640/480 the size color range application still the same = too small, you can see a black border.
Jaime