Surcode for Media Encoder CC jumbling and subduing channels

Question

I brought a 5.1 project from CS6 over to CC and the CC surcode totally shuffles the channels and renders the dialogue (mainly on center channel) nearly inaudible and coming from the left.
I created a test project in Premiere with bars and tone where the tone moves in a circle (plus a rumble to test the LFE) in this order:
Left
Center
Right
Right Surround
Left Surround
LFE
Using Mpeg2-DVD to transcode, here is how the channels are mapped on the ac3 file:
Left
Left Surround
Right
(silence)
Center
LFE
So somehow my Center channel is being mapped to Left Surround and vice-versa, while my Right Surround channel is going nowhere.
Any idea what may be the reason for this bizarre situation?

Answer 1

I have done some further experimenting and here is what I found:
First of all, the problem occurs only when using the surcode. In the case of the big CS6 project I was able to use the workaround of creating a 5.1 wav file then creating a new ac3 file from that.
With the reconfiguration of the Premiere audio tracks in CC, it seems that in order to properly transcode a 5.1 sequence with the Dolby Surcode, all audio clips in the sequence MUST be mono. Therefore any stereo source clips must be split into two mono clips and laid in on two tracks.
The dialogue tracks of my large converted projects are all mono, but I am assuming the problem is being caused by the stereo clips in the sequence.
For that existing project, I'm just going to continue using the workaround rather than reconfiguring the entire timeline.