WowAce

What steps will reproduce the problem?
1.Have Bartender enabled.
2. Do any Legion quest that has an extra button appear in the bottom center of the UI on default UI (for example, the beginning Druid Class Hall quest).
3. The necessary button does not appear.

What is the expected output? What do you see instead?
I would expect the button to either appear like normal or appear on the "extra action button" bar, which is enabled and visible in my settings.

What version of the product are you using?
4.7.2

Do you have an error log of what happened?
No, I don't know how to produce one for something like that.

Please provide any additional information below.
The extra button that sometimes appears for quests (in the default UI, it's in the middle-center of the screen) does not show up at all. This is the same button that for instance you used to trigger Garrison abilities or in the Tanaan Jungle intro to set fire to huts, but those showed up just fine for me whereas I have to disable Bartender to see the button for Legion questing.
The first time I noticed this was when doing the Druid Class Hall quest (the very first part). It keeps happening every time I encounter a quest that uses this kind of button. My friend had the same issue and as far as I know he has different settings than I do.

Do you have the extra action bar active? I just tested it here, the druid's "Nature's Confluence" button showed up on that bar.

Works perfectly fine for me. The usual reasons are either the bar being disabled or other addons interfering.

Try to reset the position of the bar otherwise.