Hi dear,
I have been in a same trouble.
It can't launch video engine when chech the enable video engine chechbox in a window of "Playback Engine...".
I tried to activate by unuse all third party plug-ins, but it could not.
Fig. dialog box
https://www.icloud.com/iw/#pages/BAI...F/Video_Engine
OSX10.9.2 Pro Tools 11.1.3