Hi all,
Just installed the CS4 Design Suite Premium and everything is swell so far with the exception of strange behavior while zooming. Whether I use my wheel mouse (logitech Revolution) or Cntrl/+- to zoom, the zooming is jumpy and all of the icons on my desktop flicker on and off. It makes no difference whether I have open GL turned on or off. I updated both the graphics card and the mouse with the latest drivers this morning and that did not help. Just wondering if anyone else has seen this or had any suggestions. Thanks for any replies.
System info:

System Manufacturer alienware
Microsoft Windows XP Professional
5.1.2600 Service Pack 3 Build 2600
x86 Family 6 Model 15 Stepping 11 GenuineIntel ~2666 Mhz
NVIDIA GeForce 8600 GTS
X86-based PC
4 GB Ram
Drive C: Size 465.76 GB (500,105,216,000 bytes)
Drive D: Size 465.76 GB (500,106,280,960 bytes)

I had similar effects. The worst was when I had a selection made and used a dropdown menu. The screen went mad. I decided to disable Windows Blinds and the problem went away

Thanks Guys,
Don't use Windows Blinds and all bells and whistles turned off (classic mode). Main monitor is a LaCie 21" Flat Panel, but second monitor is an old piece of cr@p Samsung. Resolutions are different, but refresh rates are the same. Will look more closely at my monitor settings. Thanks again. phil

Well,just turned off second monitor in the NVidia Desktop manager and the problem persists even using a single monitor. Sigh...

Plot thickens. Does the same on my Dell laptop (which doesn't support open GL.

Problem solved...I think. Went to desktop/properties/themes and chose a canned theme from the list (Desktop=alienware, laptop=windows XP). Now all weirdness seems to be gone. Thank you Robert and Mylenium for pointing me in the right direction!

Now if I can just get used to closing a file by clicking to the left side rather than the upper right corner.