HD video has choppy playback on timeline

Equipment:
New MacPro 2 X 2.93 GHz 6-Core intel Xeon
12GBs Ram
Nvidia Quadro 4000 2048 MB video card
Software 10.7.2
Video Card:  Kona 3 with 9.0.3 driver & 9.01 premier plugin
Videodrive:  7200 RPM 2 TB internal (not the system drive)  remaining space about 750 GB
Adobe CS 5.5 software
I just switched from FCP 7 to CS5.5 including a new computer which I perceive is optimized for CS 5.5.  In playback my audio is choppy and dropping out some of the time, then if I stop and start the payback it will be fine, or sometimes there is no audio.  doesn't seem to be any consistencey in what will happen the next time I start playback.  On the timeline is a 1080i ProRes file I finished in FCP 7, then imported the video & audio file to Premier to make a couple of last minute changes.  Program is 50 minutes long.  I have the sequence setup as Kona 1080i compressed.  I imagine I have missed something very basic here, but don't have a clue what it could be.  Can anyone point me in the right direction?
Thx...Jim Watt

John,
I don't really think it's applicable in this particular situation.  I have just switched to PP for FCP-7.  All my FCP 7 shows are mastered in ProRes and this last one of course was too and it's the one I had to make a small change in.  I didn't see anything in the post you referred me to that suggests that PP cannot/will not play back proRes material.
At the moment I'm screening DVCPROHD 1080i material and I'm having the same problem with choppy playback/freezes and lost audio in the viewer.  I saw a post that came from Walter Biscardi for audio setup and followed that, which did seem to help a little, but the problem still exists.  This is what i did...
Audio...set preferences in Premier to "built in output" and also set audio mapping to same, set audio hardware to "built in output"  with caches at 1024
set computer preferences audio output to Kona card...
So I think this is some sort of setup that I have missed since I get identical problem with ProRes and DVCPROHD.  Any other sugestions will be most appreciated.  I'll give AJA a call tomorrow if I can't find a fix on the forum.
thx...jw

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