Jumpy playback on 30" display

Following the release of CS3, I upgraded my G5 to a Mac Pro, with two xNVIDIA GeForce 7300 GT 256MB graphics cards. Along with my 23" cinemay display, I connected a new 30" Apple HD display. It is a beautiful thing, until I try to play movies or shows purchased from (and played on) iTunes. Playback is jumpy -- completely robotic, as if it is constantly stopping, then skipping a frame. This only happens during full-screen playback in iTunes.
Full-screen movies playing from the DVD Player or VLC are fine.
Any help will be much appreciated -- thanks --
Mac Pro 3 Ghz Dual-core with 16 GB ram; MacBook   Mac OS X (10.4.9)  

Hi-
Appears to be a problem in the iTunes software. I don't know if it would help, and there aren't any reports of anyone trying it, but sometimes software reinstall fixes system bugs ( if the problem is in ones system).
Did a search, and found that you aren't alone (kinda' counters the "system problem" theory).
You might have a look and see if any of the "fixes", a few have reported, apply to you:
http://www.tuaw.com/2006/01/26/itunes-video-playback-lackluster-at-best/
http://www.macfixitforums.com/showflat.php?Cat=&Board=iproducts&Number=780278&pa ge=0&view=collapsed&sb=5&o=31&fpart=1
http://www.macosxhints.com/article.php?story=20050707215546401&query=creator
http://lowendmac.com/misc/07/0409.html#4
PC users also report the same problems- very few fixes..........
G4AGP(450)Sawtooth, 2ghz PowerLogix, 2gbRAM, 300gbSATA+160gbATA, ATI Radeon 9800   Mac OS X (10.4.8)   Pioneer DVR-109, ExtHD 160gb x2, 23"Cinema Display, Ratoc USB2.0, Nikon Coolscan

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