Problems with "Show gaps between pages" option
I use Acrobat DC 17 on Windows 10 with two pages scrolling view and options "Show gaps between pages", "Zoom to fit page". I think there are two problems with this option.
1. When I push "Page Down" button screen flips through two pages but the subtle horizontal line appears at the top of the screen with width which is exactly equal width of the gap. This line is either gray or contains small piece of the previous two pages. If you push "Page Down" many times one by one this line will grow with every keystroke therefore big vertical offset appears. The same thing happens when I use a single page view. See top of the screenshot below to watch this vertical offset (i.e part of the previous two pages above grey horizontal line):

2. Also when I press "Right arrow" button there is no offset but every such keystroke flips only ONE page. So I have to press "Right arrow" twice to see next two pages and this is very annoying.
But if I disable "Show gaps between pages" then everything will be OK. I.e. offset will not appear after "Page Down" button and "Right arrow" button will flip through two pages instead of one.
Maybe the first point is OK and not a bug (different behavior for "Page Down" and "Right arrow" buttons) but the second point looks like a bug.
Please correct the "Show gaps between pages" option in the next Acrobat DC versions!
Thanks.
