We upgraded from 2015 to 2016 last week....
We seem to have issues with dimensions snapping to each other for arrowhead alignment. I looked thru the other posts but nothing I found there seemed to ask the same question.
We do not see the alignment line that highlights when you are in alignment.
Is there some different technique introduced on 2016? One user got it to work by messing with system grid settings....but this does not work for other users.