Following the update pushed out on June 9, 2015 to Windows 8.1 Pro users my pc would no longer connect to my Roku 2 via wireless (miracast). The Roku would detect my laptop trying to connect to it, but would ultimately disconnect prior to streaming video.
As a resolution I restored my system to immediately prior to the June 9, 2015 update and the problem was resolved.
I strongly believe that the windows update pushed out on June 9, 2015 will conflict with Miracast devices specifically the Roku 2.