Quicktime Video on an LCD Projector Problems & Refresh Rate?

I'm having an issue and don't have a lot of experience with this but hopefully someone has some insight.
When i play back video (formats including DV, DV50, HDV, PRORES422 / interlaced or progressive / frame rates of 23.98 or 29.97) in full screen using Quicktime Player (version 7.4.5) and Present (Shift CMD F) to a projector, the video plays and looks good, with the exception of during certain portions of the video (generally, with a lot of motion), i see either a flicker or what appears to be a scan line, tear, or a trace that scrolls vertically up the image. The flickering/trace is consistent with regard to a particular portion of the video, though when i adjust the refresh rate for the projector, the behavior of the flicker or scrolling trace changes (say at 60hz, it scrolls slowly up vs 85hz where i see mostly flickering/tearing of the image or multiple traces scrolling up). I've tried 3 different projectors, and every combination of screen resolution and refresh rate with no success.
I should point out that when i play these videos full screen on a cinema display (20in or 23in) i don't see this behavior at all.
So, i have a few specific questions:
1. Is anyone familiar with this behavior and any solutions?
2. The projector is connected with a VGA cable and DVI adapter. Might a DVI cable resolve the issue? Is the behavior a result of the analog input? (The cinema displays are connected via DVI and don't exhibit the behavior)
3. If it is a projector issue, any recommendations on a good projector for presenting video played back from a computer?
Thanks in advance for your help. If i've posted in the incorrect forum, please do direct me to the right place.
Shane

Just a fast reply... something to think about...
Use 60hz, most lcd are 60hz. Check you resolution specs for the projector. If the native resolution is 800x600 use that setting if higher use that.....
If your using the lcd as a secondary display try setting the main display to the same specs. Sometime a mismatch between the two displays can cause problems.
Go with the lcd spec settings that's the main priority and the main display isn't.

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# Based on octave script from http://www.linuxdocs.org/HOWTOs/Framebuffer-HOWTO-14.html.
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http://www.pcmag.com/article2/0,2817,2414804,00.asp
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