I think you mean that the iDrive knob doesn't turn any further, yes? This happens to me at various points in the various menus. (Such as traffic incidents.) As dumb as it seems, I have to "fight" the knob by turning it about a quarter of an inch past the point it wants to stop.

I believe that iDrive, in its effort to save processing power, loads a list into memory, and then calculates how far the knob can turn. The problem is that there is a flaw in the logic; it calculates only one screen full.

The "pressure" preventing it from turning more is electromagnetic, so it's not a true mechanical part that would break by continuing to turn the knob. Give it a try.

Joel