Problem with Color Sampler Points

I'm using PSCS4 on a Mac Pro, and recently upgraded to Snow Leopard 10.6.3 from Leopard 10.5.8.
I regularly use color sampler points in Photoshop when adjusting curves. I seem to be having problems getting a sampler point to show up in the info palette when shift-clicking with the eye-dropper tool, or directly using the color sampler tool. I've also tried shift-clicking from within the Threshold command, but the points I click just don't seem to take a sample and show up. I never had this problem before. I'm bringing RAW, sRGB and ARGB digital images into PS from Bridge, and have tried 8 and 16 bit.
After trying for awhile, sometimes it just suddenly starts working again. For instance, I was writing this post after not being able to get PS to take samples. Then I went back and forth between the internet and PS, and it started working all of a sudden. Very odd.
Anyone else seeing this? Am I doing something wrong? Any workarounds?
Thanks, Lou

Thanks, Mark. You may be right, and I will try it.
I have my workspace setup saved, but I presume it is lumped in with all the other preferences. Is there a way to "Export" my saved workspace setup from Photoshop, so after I trash my preferences, I can reimport at least my workspace? I didn't see the ability to do that, but it may be hiding somewhere. I like my current dual monitor setup and prefer not to have to 'redo' it from scratch.
Thanks,
Lou

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http://findae.deviantart.com/art/Converge-101214480
http://i38.tinypic.com/bjcymr.jpg
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Hi
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Funny how it's only Windows users that have this 'problem'.
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Your Windows applications, such as 'Viewer', use the Microsoft ICM 2.0 API. This *will* read the embedded profile in an image, but instead of converting to your monitor profile for output, will simply convert to sRGB. That's basically like half-a$$ color-management. Read more about it here:
http://www.microsoft.com/technet/prodtechnol/windows2000serv/reskit/prork/prdn_img_vkev.ms px?mfr=true
Firefox & IE don't even use the ICM 2.9 API, making them entirely non-color-managed. Whatever the raw RGB values are in your image, these applications spit out at your monitor.
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OK, ready?
The original monitor profile that came with my MacBook Pro (profiled by someone over at Apple generically for all MacBook Pro LCDs, I guess) really seems to have underestimated the gamut of my monitor. Hence, color-managed applications compensated for this be resaturating my images (especially in the oranges/reds) before outputting to monitor. Therefore, images looked really nice and saturated in color-managed applications; however, when I exported them to sRGB JPEGs and then uploaded to the web, they looked desaturated (in Firefox, NOT in Safari, since Safari is color managed). They even looked desaturated on other people's monitors (these 'other people' were your average Joes...).
I then profiled my monitor using an i1 colorimeter. A 3-D plot of my monitor profile now showed that it actually had a much larger gamut than what Apple had predicted in their profile (but this gamut was still much smaller than sRGB, or the gamut of my Dell LCD or Sony CRT, etc.). Therefore, now, LR and PS, using this new profile, showed images much less saturated. Now when I made my edits, and then exported to sRGB JPEGs, images looked slightly *more* saturated in non-color-managed applications and on other people's computers.
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