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Note that you'll get a much better audience of Lightroom users in the main Lightroom forum: Lightroom Classic CC . This forum (Lightroom SDK) is for the few of us who are working on writing Lightroom plugins.
That said, yes, it's possible that being an "early adopter" of Sierra is contributing to your headaches. It may be that you need an updated driver for the tablet. Or it could be a bug in Lightroom that only affects Sierra users. I've not "upgraded" (from OS X 10.11) yet. And I may never do so, if software developers don't require it. Anyway, I've learned the "hard way" that it is best to wait out the "dot-oh" releases for at least a few months and let other people report the bugs rather than being stuck with them.
Anyway, can you use the mouse or tablet to move the sliders (Highlights, Lights, Darks, Shadows) below the curve, rather than actually dragging points on the curve? Can you click a point and move it up/down with the arrow keys on your keyboard? This might help troubleshoot or shed further light on the problem.
Update: Having just searched, my suspicions that using Sierra is likely your problem seem to be confirmed. There are numerous threads where people talk about issues like what you are describing since the release of Sierra. See:
- Drifting Tone Curve post-macOS Sierra update? and
- Lightroom CC Tone Curve Adj Issue and
- LR Curve adjustment difficult on MacOS Sierra
Unless you are being paid as a software tester, I suggest you think of "major" OS X releases as "unstable/beta" and wait until you cannot help but upgrade (due to too many critical software packages requiring the "new" OS). At least a few months is usually required before such issues have all been resolved. That's been my experience since I owned my first Mac (long before OS X), and I got this advice from professionals who worked in the desktop publishing industry at the time.
Thanks for your reply!
I also think that this may be the driver for the tablet. As the driver for the tablet has also been updated after the release of Sierra, and I was faced with the problem Alt jam. But I can not return to the previous driver, since it does not work in the Sierra.
Tell me, please, how can I control the points on the curve with a keyboard? I can do this in Photoshop, and not in Lightroom. The point does not become active by clicking on it
This bug has now been acknowledged. The team is investigating.
Any updates to the issue will be shown here: Lightroom 6: Tone curve is insensitive to MacBook Pro touch pad | Photoshop Family Customer Community
It would help if you could add your voice there and your System Info (Help > System Info > Copy or Save As) to provide the team with more info.
The device (Macbook touch pad) is a red herring and should not be in the issue title/description. The issue is Mac OS Sierra.
There are a lot more users of Mac OS Sierra than Macbook Pro trackpads AND the numbers are increasing rapidly, by the day, as more users decide "it's been long enough; I'll do the upgrade now" (and all new purchases of Macs will be affected). Anyway, many reported this issue on systems without a trackpad, so it shouldn't be in the issue title, especially not for the "official discussion thread". Just my 2¢ (as someone who has significant experience in software QA and managing an issue queue...).