[soundista]

I solved a Video Engine trouble myself.
I could not find a reason why video engine did not start.
However I found the method to run at last.
Therefore I use an Activity Monitor.
At first Pro Tools started, Activity Monitor shows Avid QuickTime Server does not work by red letter.
To force quit Avid QuickTime Server, double click the red letter and open dialog.
After quit the process of Avid QuickTime Server, restart the Pro Tools, not restart a OS.
That' all.
After the quit the process of Avid QuickTime Server have been freezed one time, Pro Tools can run Video Engine.