CS5 Mac playback issues

This is a baffling problem. I have a fully updated Premiere CS5 installation on a Macbook Pro (4,1), created an HDV project with the DVCPRO 720p24 preset, and proceeded to import the MXF files from my Panasonic HVX200P camera.
Once the files are loaded, I can see the clips, add them to the timeline and scrub through them. However, when I attempt to play them back at normal speed, I can only see 2-6 frames of playback from the starting point before it stops. I was able to blind-edit some clips and the exported file came out fine, but not being able to preview the project from within Premiere is kind of a deal-breaker.
After further inspection, this issue is not limited to the Panasonic files. SD and HD H.264 MP4 files exported from both Premiere and FFMPEG have the same problem.
Does anyone know if this issue is fixable?

Never mind, I fixed it. It turned out to be a permissions issue, which makes no sense at all. If anyone at Adobe is reading this, please tell your dev team that if a user has permission to read a file, they should have permission to play that file. Thanks.
If anyone else has this problem, here's what I did to fix it:
Open Terminal
Type the following commands:
cd /directory/your/project/and/media/files/are/in
chown -Rv yourusername *
chmod -Rv a=rwxrwxrwx *
Enable root user (http://support.apple.com/kb/ht1528)
Log in as root user
Open the project file
Save the project file
Log back in as yourself
It should be fixed.
I would have used the Disk Utility "Repair Permissions" feature, but for some reason it was grayed out for this drive.
Thanks to daniel.hyblak for tipping me off to the solution. Here's his post: http://forums.adobe.com/message/2985085#2985085

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