Vista - Display setting for different users

Everytime I log onto my account after a reboot the display settings reset
automatically to 8 bit color. To make most thinks look normal I must go into
the Control Panel and update the display settings. I don't have to do this
though when switching between user accounts as in these events my settings
are remembered.

Other accounts do not have this problem. But not only do they display in 32
bit color when first activated but everything is displayed in 32 bit color
including for example the gadget screenshow

I cannot find any differences in the user account settings that would create
this problem.

Any ideas how I can change the default display settings ?

Vista 32bit RC1