Problem: iDrive controller won't scroll

[brian5]

The iDrive controller normally responds to:
1. move (in 4 directions)
2. turn (e.g. scrolling)
3. press

Mine has just stopped responding to the "turn"! If I select any menu (Navigation, Climate, etc.), it just stays on the first option and will not scroll. It rotates but nothing happens on the display; it just stays on the first option. The iDrive controller "feels" like it should be working. Both the "move" and "press" functions are still working.

Any ideas appreciated. Otherwise, I guess I'm going to dealer next week. Unfortunately, I have to go out in the snow storm that is in the forecast for tomorrow.