Photoshop color problem on external monitor

I'm using MacBook w/ OS X Snow Leopard, NEC LCD2490 monitor attached, both displays calibrated.  I found at some point that colors in Photoshop were WAY off on the NEC.  Images looked "correct" in Lightroom on the NEC, but when opened in PS I had massive color shift and desaturation, e.g. purple flowers became dull gray-blue.  I could drag the same image to the laptop and it appeared "correct" in both LR and PS.  I checked color settings, etc. and couldn't find a problem, but presumably that would render the image incorrectly on both monitors.  Most significantly, the image appears "correct" even on the NEC monitor when the laptop display is off (clam shell mode).  Summary:  Dual monitors:  LR/PS correct on laptop display, LR correct on NEC but PS is WAY off.  Using external monitor only:  image displays correctly in both LR/PS.  I suspect this is a hardware/firmware/OS problem vs. PS.  Anybody else have this problem?

Snow Leopard has some known problems with color managing external monitors.  We've been looking into it and notified Apple (as have a few other color management experts).

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