They do match… I just drop my videoclip onto the ‘make new sequence’ button to make sure that everything lines up nicely. The latest sourcefile that had this occuring was an MXF exported from Avid:
MXF File details:
Wrapper type: MXF OP1a (type: SingleItem SinglePackage MultiTrack Stream Internal)
File generated by: AVID, TRMG (3.01)
MPEG-2 422 Long-GOP
I’m betting it’s the long-GOP thing, isn’t it?