Mysterious Window Circuit Problem

[bustedbenz]

Something strange happened today. I got in, started up, rolled the windows down, drove around for a while, just like usual... rolled them up for a rain shower, rolled them back down.... or tried to. All four windows were randomly dead.

Funny thing is, the auxiliary circuit that allows the windows to function with a door open but the switch off... works perfectly. All four windows working on that circuit. However, with the doors closed, all four windows are now stone dead.

Can't find any other electrical problems to speak of. Fuse box looks okay.