Snow Leopard pink/magenta colour cast

I have a slight problem...
After waiting for several months to give everyone a chance to sort out some of the inevitable bugs with Snow Leopard, I have just updated my MacBook OS. I have also downloaded the latest 10.6 drivers for my i1 Display2 calibrator and my external (hardware calibrated) screen.
My colour calibration was all spot-on until today. Now my external screen has suddenly acquired a definite pale pink/magenta colour cast, including with my old profile that used to work so well.
Has anyone else had any calibration problems with Snow Leopard? Any cunning ideas on a fix for this?
Very grateful for your thoughts.
Ian

There is a problem with Snow Leopard when using profiles and printing from Photoshop. I'm not sure if your problem is related but here are two links to check out.

An article from the BJP.
http://www.bjp-online.com/public/showPage.html?page=871276

And here's the workaround.
http://www.luminous-landscape.com/tutorials/solving.shtml

Thanks Keith. Not quite the same problem that I am currently having, but I will keep an eye on that one too now that I know about it!
Cheers
Ian