Dear All,
This is not so much a media composer issue as a plugin issue. The issue is occuring at a customer of mine who is using MC 8.6.5.
When applying a Dyn3 limiter compressor on 2 duplicated audio channels, A1 and A2 (where A2 is the duplicate of A1) and monitoring the phase relationship in izotope when A1 is panned left and A2 is panned right it is obvious the phase relationship between the 2 channels is completely gone crazy. If the channels are panned back to mid (mono) this results in a phasing effect where most of the time the high frequencies are cut off.
The workaround is easy. (Why would one duplicate the mono audio in the first place if the audio sync is further untouched. answer: I like working dual mono as I get 6db extra for free when mixing with music... No don't ask 
)
But now comes the weird part. Moving the tracks to A3 and A4 can fix the issue. That a compressor plugin is not phase linear with itself I consider a bug but ok, if the bug is consistent throughout its use... but no. It depends on the length of the clip, position in the timeline and/or sequence tracks it is applied to. That makes very little sense to me,
Has anybody else seen this behavior of the Dyn3 limiter compressor plugin?
Thanks.