When I adjust things such as exposure, shadows, highlights, etc, the histogram changes to reflect these adjustments. However, the Tone Curve window just below does not reflect these changes and it is confusing to me as to whether any subsequent changes I may make via the Tone Curve are going to be accurate.
For example, if I increase the exposure, the histogram "mountain" moves to the right, yet I've still go the original mountain crunched up on the left edge of the Tone Curve, so it's not clear how it will interpret any changes I make to the tone curve.
I withdraw the question...
I don't know if my eyes were deceiving me but once I put the mouse in the Tone Curve it actually does update, just not instantly in lockstep with the main one, which threw me off.