OS 10.1.10& QT7.1.6 problems playing older P2 material in FCP5.1.4

Just purchased a MBP yesterday. Playing a 720 24p DVCPROHD movie on a 2.4G Macbook Pro 17" hi res 7200 internal drive, 2G RAM 800 fw 7200 exteral scratch disk. OS 10.4.10 QT 7.1.6 FCP 5.1.4 One layer, Older P2 material placed on a timeline display images with shifting horizontal segments when the camera pans. Static images do not have these horizontal break ups.

Previous P2 material was loaded into a G4 using OS 10.4.9 & QT 7.1.5.


Also have an Imac 17" intel 1.8, OS 10.4.9 QT 7.1.5 FCP 5.1.4 using the same FW drive through a 400 port using the same fcp project, pans are smooth, no horizontal shifting.
New notes:

Just imported a P2 card on the MBP using the dual adaptor, looks perfect on playback. Must have something to do with the new OS and or QT versions not interfacing with old P2 material imported using previous OS or QT environments.

Stuff imported using the dual adaptor plays fine on the Imac.