My system has three monitors arranged 1-2-3-4 where 2 is my main monitor and where GW2 is displayed. When using GW2 in Fullscreen with DX11, I often switch to another application such as Chrome on monitor 1 using Win-Tab keys. GW2 is still visible on monitor 2 and when I move the mouse over the surface of monitor 2 without clicking, GW2 grabs control of the mouse pointer and will not let it keep moving to any other monitor. When using DX9, this behavior does not occur. It is quite annoying.