Strange problem with my CLK windows. Exiting the car, the window drops as normal but when door is closed/locked, the window doesn't retrun to the closed position. If I close it manually from inside, then exit from the passenger side, the same thing happens with the passenger window.

Can't think why this has started to happen, any ideas ?. Car is now sitting with either of the windows open a couple of inches and it's pouring with rain.