I'm updated to the latest version. When editing an NEF image in LRC I notice (so far) when moving the sliders in the Basic tab, like "Hightlights", when I get to what I want, then upon releasing the slider the image changes to what I don't want. I noticed this on several of the sliders. To check this I took the same image and edited it PS and used the filter to edit in raw. The sliders in this case worked correctly and did not change when releasing the slider as it it did I LRC.
Thanks for your response. When this happened, I had just updated LRC and started my work. So before trying your suggestions I shut down LRC and re-launced it. Seems like the problem went away. I'm not sure if this is particular to MAC or not.