Why do my exports have artifacts at the beginning?

I'm a bit stumped on this issue, mostly because it's very subtle and doesn't stay consistent. I export mp4 videos from Premiere CS5 at least once a week, and a lot of times (though not every time, which is odd), the video will have some digital artifacting at the very beginning and very end. It only shows up for a second or so before fading away, and then everything is fine. It's only visible after exporting - the footage in the timeline is perfectly fine. Any suggestions on what to check would be most appreciated.

More information needed for someone to help... please click below and provide the requested information
-Premiere Pro Video Editing Information FAQ http://forums.adobe.com/message/4200840
Exactly what is INSIDE the video you are editing?
Codec & Format information, with 2 links inside for you to read http://forums.adobe.com/thread/1270588
Report back with the codec details of your file, use the programs below... A screen shot works well to SHOW people what you are doing
https://forums.adobe.com/thread/1070933 for screen shot instructions
Free programs to get file information for PC/Mac http://mediaarea.net/en/MediaInfo/Download
Does your video use a VARIABLE Frame Rate or a Constant Frame Rate?
Are you 100% sure your edit sequence is correct for your video?
The NEW ITEM process will ensure that your editing sequence matches your video file
CS5-thru-CC PPro/Encore tutorial list http://forums.adobe.com/thread/1448923 has a link to learn about the NEW ITEM process, including a picture to show you what to do
What are your export settings? (a screen shot of those might help someone help you)

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