I know this thread is old but rather than post a new one, I can add to this one with the solution.
The rocker switch has two small tabs where it pivots, and the tab is broken on one side. This is what I found was the case on i mine. The exact same symptoms as the OP, driver window express switch would not work up, but all other function as OK. After I ordered a new replacement (knockoff switch cluster 7p6959857) from Amazon, it takes less than ten minutes to replace.
Pop the armrest up using a plastic trim lever from the rear of the door. Then disconnect the electrical connector. There are 6 small tabs holding the switch cluster in the armrest, use small screwdrivers ( 2 ) ) or thin plastic trim levers to carefully pop it out, this was actually the most time consuming part of the repair.
Pop the new switch into place, connect the cable, then pop the armrest ack into place. That's it.
I paid $14 for the switch. rather than $145 for VW OEM. It functions the same, but the tactile feel is actually better than my original window switch. The two detents for express or just manual motion are easier to find by feel. On my OE switch I would always click past when I wanted to crack a window open, it would express open down, miserable annoyance. Glad it broke actually, LOL.