Anyone else having this problem with their 7359 2-in-1? The auto-rotate mode button is missing from the Action Center after the latest Windows 10 Anniversary update - not grayed-out - totally gone, and flipping on the Tablet mode doesn't help.

Using Ctrl-Alt-> to force the rotation works, but, clearly, it's not a suitable solution.

I tried deleting/reinstalling the sensor in Device Manager, as per one suggestion, but no change. Dell? Experts? Any solutions out there? TIA.