I had this issue on chrome version 51. It went away when I upgraded to chrome v53.
Cant add tags because of overlapping taskbar on topic creation
Problem experiencing date: 5th-Aug-2016
Taskbar : This bar is the bottom fixed bar where an appears at the right bottom place for toggling new topic.
@smartameer which theme are you using?
@pichalite , the default theme of nodebb, with none of the custom skin its working.
Fixed on latest themes.