look up three finger tap doesn't work in “Preview”

I have the same problem in browser.
It seems it was not fixed in next update 🙂 today is 9th of March, so it is 166 days no fix 🙂

Also I could not "sign in" here from Chrome, it was just white form instead of login, look at screenshot:

as I can see, screenshot is showing in editor, but not showing in comment 😀

and also no button save in edit mode 😀
found it on the bottom of the page after few scrolls down

Briefly had the same problem with the three fingered tap not including the dictionary following upgrading the OS. However noticed that upon loading the dictionary app, the three fingered tap bringing up the dictionary then worked.

By "the same problem" do you mean the three-finger tap problem?

This seems to be something specific to your system, so waiting for an update to fix it is bound to end in disappointment. Three-finger tapping works for most users, it works fine for me in Preview, Safari, and elsewhere.

The Save Button when you do an Edit to your post goes all the way down, after the post you were replying to. This is bad design but it has to do with how these forum pages work. It has nothing to do with Sierra.

About your Chrome problem: I don't usually use Chrome, but I fired it up, and had no trouble login in to this forum...

All of these suggest that there are problems specific to your system. I recommend you start a new thread, give specific details about your system. The best way is to run Etrecheck and post its report. It will give a description of what your mac is and what software it is running. This often helps figure out the "bad guys" - old software, antivirus, incompatible software, "cleaners"....

I'm having the same problem. Thought it was a bug. Restarted my Mac, nothing. I'm sure  will solve this problem with its next update.

I see the same behavior regarding three finger tap.

Note that with one extra step, you can achieve the same result (just as you could in previous OS versions). Simply do a two-finger tap, and then select "Look Up [whatever]" from the resulting drop-down.

Absolutely same problem!!

I hope  fix the three-tap thing soon, too.

My friend and I have exactly the same problem.

So annoying 😟

Hope they fix it soon

Same problem. This company is getting more and more ridiculous in every update. This Sierra, what's exactly the update?? Siri?? W*T*F* they have in their mind.

Thanks for bringing up this issue.

I got the exact same problem: 3-finger lookup works elsewhere but NOT in "PREVIEW" when reading PDF.

Also, when highlighting text in "PREVIEW", it tends to double highlight EACH and everything.

Is APPLE aware of this bug?