they can be a real pain....
do you have a photo of the interference?
It is possible that a fault has developed with the VQS box - I've seen this before too...

Might be worth trying some decent VGA DA's with buffering and isolation (Kramer VP-3xL) - these work with similar issues on Matrox TH2G (if your issues is the same)

If you can survice without LCD on output 1 - try a Matrox TH2G and use output 1 for a projector too - or 2 x Matrox DH2G. (Would also suggest the use of the VP-3xL Da's too)


Simon