Dolby Surround Missing Right Surround Track on Blu-ray

I author a large number of DVDs in Scenarist for our standard def applications, but recently, tried authoring a strait through Blu-ray disc with Dolby Surround 5/0 audio tracks with some peculiar results.
I've encoded the Dolby track the usual way, with Scenarist's Dolby encoder, and imported it along with the m2v video track in to Encore and burned a Blu-ray disc.
The front channels play normally, but the surround is half missing, or perhaps 3/4 missing, when accounting for the fact that the left surround is about -10dB from where it should be, and there is NO output at all from right surround.
At first, I thought it was because we encoded at 640kbp/s, but I am told this is a legal bitrate for Blu-ray Dolby surround.
So that leaves Encore as the remaining suspect.
SD DVDs encoded in Scenarist with this Dolby encoding method play as they should. The difference here is we're using HD video and encoding to a Blu-ray disc.
Might Encore be doing something to our Dolby tracks? Is it confused because the LFE channel is missing? Or is Encore unable to handle 640kbp/s Dolby surround?
Wanting maxium quality, and because I could find no means of producing 5-channel PCM audio that Encore would accept, I went with Dolby at the highest bitrate. But obviously something's amiss here. What should I change about the encoding, or in Encore?

Hmmm, then I'm puzzled by this... if I encode AC3 and use it on a standard def DVD, it plays with all surround channels. If I use the AC3 file in an Encore project to make a Blu-ray disc, the left surround is barely audible and the right surround is silent.
It's either got to be my Sony BDP-S301 can't handle 640K audio, or there's a possible bug in Scenarist's Dolby encoder when using bitrates higher than 448K.
I'm re encoding at 448K and reburning the BD-R to see if that will play properly. If it does, then there's some incompatibility with the higher AC3 bitrate, somewhere.

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