under adjustments>curves my curves adjustments now work in reverse, ie, to lighten an area of an image, I now have to pull down from whatever point I chose, the same is true for left/right slide. Dropdown menus open to the left rather than the right side of the main drop down.
I'm not sure if this fits your description, but what comes to mind for the Curves is that the setting under Curves Display Options has been set to Pigment/Ink instead of light. That will reverse the Curves. For the panel menu, the only thing I can think of is position. That will change sides according to where a panel finds room to open. If the panel is up against something, it will open to the left instead of the default right.