I'm having an issue with a Bluray build in Encore CS5.5. I have an h264 Bluray video file with a matching 5.1 AC3 file that I exported out of Premiere Pro CC. Encore accepts the AC3 file just fine and doesn't transcode it. However, when I burn the disc and play it on my home theater, the audio comes out as stereo. All the surround speakers are playing the same audio and nothing is mapped like it should be (dialogue in center speaker, ambient in rear, etc).
The really odd part is that I've made a DVD version of this exact same project, and the 5.1 plays perfectly fine. Why is Encore doing this? I can't understand why a DVD 5.1 would work fine but the Bluray doesn't!