[philosopher]

I have the same flashes (vista 64bit). And I've had them right from the start. I've always assumed that they are supposed to be there.

Originally the screen saver started up slowly enough for me to be able to notice that Vista was switching into its "Windows Vista Basic Color Scheme" mode.

Vista does this for certain programs. For example whenever I use the "Fireworks" graphics application Vista switches. And I get the same "flashing" behaviour with Fireworks.

I've never looked into why it needs to change modes. But I believe the screen saver is causing Vista to switch.

I don't see a need for this to be fixed. But if it is deemed a "bug" then I think looking into Vista's Basic Color Scheme mode will lead to the resolution.