OS-wide color sampling glitch

When I try to sample colours using Photoshop's colour sampler, it retrieves the wrong shade (quite the wrong shade, in fact). I figured this was a glitch in Photoshop, but I tried using the Apple colour sampler and found it had the same problem. Finally, I downloaded the colour sampler at http://fadingred.org/icolors/ and found that it too had the same problem.
Obviously, the problem is deeper than I initially thought.
Before making this thread I did a search and found this archived thread where two people cite the same glitch:
http://discussions.apple.com/thread.jspa?messageID=2547129
The last post there even has a video of the problem in action.
The question is now what do I do? This problem came up a long while back, but now that I have a big project underway, one in which precise colour is absolutely critical, it's imperative that I have the ability to sample them from the screen. If I don't have Applecare, is there any route I can take to get support for what seems like an enormous, fundamental problem in the operating system? I imagine it affects some operations I'm unaware of as well.
And before anyone says anything about color profiles, this problem occurs with any color profile I use (be it Generic, Cinema Display, or our default of sRGB IEC61966-2.1).
Thanks in advance for any help anyone can offer.

After a lot of mucking about, Adobe and I figured out what my problem was. I hope this solves your issue as well.
I have been exporting a lot of my art lately as png and jpg using the "save for web" dialog. This dialog is the same for both CS1 and CS2. Now, here is the "AHA!" part. In the "Save for web dialog", note the "fly-out/popup" at the top of the window and just to the left of the "Save" button. If you mouse over it (without clicking) it will state "Preview Menu". Sounds non-descript eh? Well click on that and out pops a series of Color palette options. UGH nice way to hide an integral part of the workflow Adobe. Pick "Standard Macintosh Color". Now all of your colors that you export as png or jpg should match precisely using the "Save for web" dialog.
Screenshot: http://medulla.ambrosiasw.com/~marcus/images/screenshots/cgtalk/pshopbaggui.jpg
If this doesn't work for you... then you need to start with the lowest common denominator. Open your Apple preferences, click on "Displays" and then click on the "color" tab. Select "Adobe RGB (1998)". Close the prefs. Open Photoshop, goto the "Edit" menu and select "color settings". Form the "Settings" pop up, select "Color Management Off". Now below in "Working Spaces" Under RGB select the same exact matching profile "Adobe RGB (1998)". Then move down to "Color Management Policies" go to RGB and select "Covert to Working RGB" from the popup. Reboot photoshop. Your settings should now work and when you sample from images in other applications they should match or be off by a factor of "1" which is not perceivable to the human eye.
If the above works for you (this is a quick way to test) then all is good. Now go back and create a custom profile that works for your setup and then apply the same approach to the above to have consistent color throughout your workflow. Make your adjustments to the color settings in Photoshop one at time and be sure to keep checking the color matching as you go along. 
I hope this helps!
PowerMac Dual G5   Mac OS X (10.4.6)  

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