Colour Corruption when Projecting Quicktime

Upon connecting our Sharp PG-F212X projector with either the white iMac or newer silver iMac computers running OS X.10.5.7 we get a corruption in the colours in any Quicktime movies played, and also the default Aurora background (that one background in particular, but no other). The colours of icons, images or any other background are not effected. These corrupted .Mov files can be played in other movie applications such as VLC or MPEG Streamclip with no corruption. Although video can be played by avoiding Quicktime, programs such as iMovie cannot be used properly as it depends upon Quicktime.
As far as we can tell, this bug can only be worked around by turning off the projector, computer, zapping the P-Ram, changing the resolution to 1024x768, and then reconnecting- however any change in the resolution will again corrupt the image. Attempts at resetting it by changing back the resolution, refresh rate, and other combinations have not been successful.
The corrupted colours can be described as super saturated, complete loss of mid-tones (low colour depth) with only reds and greens coming through.
This happens on multiple computers (tested over 5) with only this brand of projector (tested on other brands successfully as well as other sharp projectors unsuccessfully). We have tried VGA and also DVI connections, and also different adapters and cables. Since this is the model that we have ceiling mounted in our lab, we are hoping there is a solution.

I have tried fit to screen, fill screen, etc - I still get the 2 smallish images, and the left one is cut off a bit.

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