After effects ram preview video playback issue

Greetings -- I have Mac Pro 2.93 GHz 12 Core with Nvidia Quadro 4000 & 24GB Ram.
During ram preview playback, it seems as though the video isn't refreshing fast enough in the display -- meaning its almost as if I can see the refresh on the top/bottom half of the frame happening separately.  It's a bit diffucut to describe, actually.  This does not happen with the same clip in Premiere, just AE.
The rendered video is fine and plays in QT/VLC, etc. without issue, it's just ram preview and is very distracting.
Any help woul dbe greatly appreciated!
Seth

CS6, 720p clip, 100%, Full, 29.97 fps. This may be related to the preview settings... It seems to go away if I turn it to final quality v.s. adaptive. 
Fast Draft:
Available
Texture Memory:
409.00 MB
Ray-tracing:
GPU
OpenGL
Vendor:
NVIDIA Corporation
Device:
NVIDIA Quadro 4000 OpenGL Engine
Version:
2.1 NVIDIA-7.10.2
Total Memory:
2.00 GB
Shader Model:
CUDA
Driver Version:
4.2
Devices:
1 (Quadro 4000)
Current Usable Memory:
1.11 GB (at application launch)
Maximum Usable Memory:
2.00 GB

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