CMYK oversaturated on NEC 3090

I'm using a new NEC3090WQXi with Photoshop CS4, working RGB of Adobe'98, and working CMYK of US Web Coated (SWOP) v2.
Changing from RGB to CMYK under the above settings, the CMYK values represented on the above display are oversaturated and not in sync with what the actual CMYK number values are of the image(s).  This monitor does have an extremely wide gamut, but this effect is not repeatable in CS3, on the smae exact images, so it is throwing me for a loop.  I never had this problem before using CS4, so I am assuming it is something that must be adjustable without having to go back to CS3 in order to view CMYK for more true color representation.
I attached ascreen cpoture here of what I am seeing - the top images is CS4 and the bottom is the same image in CS3 (please disregard subject matter - its the project I am currently in work on).
any input woulkd be greatly appreciated.  thanks

Still have not been able to solve this, and I am getting very frustrated by the problem.  Working in CMYK on this monitor with CS4 is impossible - it should not be more saturated than RGB, as we all know about the CMYK gamut. Why it does not have the same issue in CS3 is beyond me.
After recalibrating numerous times over the last several months, I have attempted to contact NEC to see if they can offer any advice on the problem, as far as the monitor and their SpectraView calibration software (with internal LUT adjustments) is concerned.  If I can get a response from them, I will post it here.  Meanwhile, I can work in CMYK in CS3 just fine,but CS4 is still over saturated, both using the EXACT same color settings, on the same monitor, as listed above.
Here's another view of what is happening  in CS4 (attached) - CMYK on left, and in RGB on right [ image>mode>RGB ]
Any other ideas would be greatly appreciated.  thank you again

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