I sent a bug report to Adobe about this some months ago and was verified by some users too.
It is the version of the Mainconcept DV codec that uses PPro that have the problem.
At the Mainconcept Site there is a new version that fixes it, you have replace/rename the file MCDVD_32.DLL(before replace, make a backup) with the new MainConcept DV file.
The correct version is this, Mainconcept DV codec is 2.4.16
But you must to buy it, it is not free, even for PPro users 🙁 Anyways you can verify it if it works for you with this demo version.