Any mpeg2 imported and dragged to the timeline will crash PE4 in a heartbeat (on my system).
Halt/Crash details indicate that "ippmpegdecoder.dll" is the culprit.
(This is not a showstopper as I get around it with a convert to DV-AVI).
Used google, and forum search for any details, but not too much surfaced.
One post indicated it was a Soundbooth Plugin.
I'm suspecting a bad/broke/corrupt codec, but just guessing at this point in time.
Any ideas or suggestions are welcomed...
If the MainConcept CODEC is broken, a Repair Install should reinstall that element and then you should be good to go. I will say that MPEG is tougher to edit, than DV-AVI Type II files. Personally, I always convert via a 3rd party program. Since I edit SD material only, I do not have to worry about MP4 and AVCHD files.
As most MPEG material is not really designed to be edited (it is a delivery format), as it is a compressed GOP format with I-frames and P-frames (difference frames) it needs to be converted either internally (PE), or externally.