[Adam Beachler]

Ok, so i was having this same issue, captured footage (mine = p2/.mxf) was imported and dropped into timeline, audio would play in the reference monitor but the video would not.

I believe i may have a solution that will hopefully help some others out there.

1. Start>> RUN>> Open: msconfig

2. Services Tab>> check “Hide all Microsoft services”(VERY IMPORTANT)

3. Click “Disable All” (uncheck’s all service boxes)

4. Save all open files if needed and restart your computer

5. Open your project once again and click play button in the reference monitor “your video should play” Hooray!

6. Now the tedious part… you will have to go back into the “Services tab” from the “System Configuration Utility” and one by one check and APPLY those Services, then test your playback again to see it is disabled.

Ultimately you will do this tedious part(6.) to find the root service that is affecting your play back

I really hope this helps it worked for me. Besides this i can offer no other help on this problem. Really there could be a 1,000 causes for this problem from out of date graphics card drivers to improper project vs footage settings. Cheers!