page scroll during playback

[songman]

Hi all,

Trying to upgrade to a 1.25GHz MDD Dual MacG4. MacOS 9.2.2, PT 5.1.1 Mix System with expansion chassis. I cannot get "page scroll during playback", nor any of the other choices to work properly. The timeline will move off screen and might erratically appear again "somewhere" on screen for one pass but that is it. After that nothing moves and the screen "might" jump to the timeline position only when stopping playback. When starting playback again the timeline insertion then again erratically starts somewhere on the screen. I've tried everything I can think of. I'm using a DrBott powered screen cable extender but that never gave problems before and Norton gives perfect results for everything (CPU, FPU, video, disk). All preferences and settings as they were on my former 500Mhz Mac and there all worked perfectly.

HELP PLEASE!

Cheers, Bob.

Some setup data: 1,5 Gb RAM, Radeon9000 video card with recent ATI software downloaded from ATI site, DAE buffer 2, DAE memory 300Mb-360Mb, PT memory 100Mb-160Mb, hardware buffer size 256 samples, cpu usage limit 70%