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Premiere Pro CS6 playback freezes, regenerates .pek and .cfa files

When I try to watch something in a sequence, the Program Monitor freezes. The playhead moves in the timeline as usual and the audio plays just fine, but the visual freezes. Sometimes it stops a few seconds after I start playing and sometimes the video never plays at all. When I stop playback, it remains frozen for a while, then resets to the frame the playhead is on.

 

As I checked different options, I discovered Premiere is regenerating both the .pek and .cfa files every time I open it, even though all of my projects have already conformed. I have it set to store the media files with the project, so I know the preview files have not moved or been deleted. I work on this setup 8 hours a day, 5 days a week, and nothing changed since I was in yesterday. It was working fine when I shut it down last night, no one could have logged in while I was gone, and this morning it doesn't work. No updates were installed, no files were moved, no drives switched.

 

I have searched the internet for help, but all of the forums I've found are at least two months old and recommend installing the 6.0.3 update. I did run updates for all my Adobe software, and it didn't help. I also deleted and re-rendered my peak and cfa files.

 

One six-month-old forum said that Premiere CS6 cannot playback long AVCHD .m2ts files. Previously I had no problem working with .m2ts files 35 minutes and shorter, or with .mp4 files up to 75 minutes long. The video I'm currently working with is about 75 minutes long. And again, it was working fine yesterday.

 

Further investigation revealed that playback does not freeze when I import a selection from the Source Monitor (vs. importing from the Bin and trimming in the Timeline) and do not layer clips or apply effects.

 

Any thoughts?

 

Thanks.

 

Media Spec:

File type: AVCHD Video

Resolution: 1920x1080 (1080p), 29 fps

Imported from camera hard drive using PlayMemories Home

 

Computer Spec:

Adobe Premiere Pro CS6

Windows 7, 64-bit Service Pack 1

Graphics card is Quadro 5000, driver 276.19

OS/boot drive is a solid state 250gig, and files running off a 2TB local hard drive


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