Have taken car into a dealer and have been advised that if battery has gone flat, the sensors will need resetting, to do this, disconnect freshly charged or replaced battery for two to three minutes, reconnect, turn key to position two and operate window. Hold button down and wait for click (window open), close window and hold button in close position until you hear the click. This should reset the sensors to open and close positions. Juddering maybe caused by build up of grime in slider, squirt some silicone based lubricant into window slider/guide, this should help. If none of this helps, it could mean that the motors need replacing.
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We have a 1998 230 clk and have exactly the same problem. Also, the electric roof sticks
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