On Windows XP SP3, with fast user switching, when I switch from a user to another the color settings (I have calibrated the gamma for both users) are not applied. If I go to CCC - color settings I can see a button to "re-enable AMD color control", and if I click it the gamma settings are applied. But I have to do this manually. Why does this happen? What is "disabling AMD color control" so that I have to re-enable it myself?

This is happening with the latest drivers as well with all the previous ones.

Sapphire Radeon HD 5750/1G

Windows XP Professional SP3 x86 (ITA)