Impossible to set display resolution on video projector - nvidia 6600

Hi,
I have an Infocus LitePro730 projector. Under Tiger, when I connected it to the secondary video port of my G5 (nvidia GeForce 6600), it would get somewhat correctly detected (the Monitor pref pane would give me a vast choice of screen resolutions from which I could pick the max one (1024x768) that my projector can handle.
Since I upgraded to Leopard, this no longer works. When I plug in the projector, the only resolution choice I get is a lame 640x480. I tried pretty much everything (plug on the other port, re-detect monitors, cold boot with the projector plugged in, reset the PRAM, etc), none would do.
Then I tried to plug the projector on my PBook G4 (ATI Radeon Mobility 9700) which is also running Leopard, and there I got what I expected: a huge list of screen resolutions from which I could pick the right one.
I'm using a DVI-VGA converter to plug the projector as it only does VGA (no DVI input). Is this a known bug with nvidia drivers in Leopard? Is there anything I can do to override what Leopard thinks is the max supported resolution on this "display" so that I can properly use my projector again?

I have the same problem with a pair of LG LCD displays. It does not appear to be limited to your projector.

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