While in the project-monitor the video (from a webm-video without any audio-track) and audio (from an ogg/vorbis file) play back correctly, in the rendered out video-file the audio track is always missing. I've tried different formats (webm, theora) and all available bitrates. Audio never makes it in the resulting file. I've also tried all possible options for audio-export in the render-dialog... none of them made a difference.

What options do I have to "debug" this further to see what's going wrong?

Best regards...

MacSlow

Did you try an output that does not use theora?
Did you try an audio-only WAV output?
I never have this problem. Sounds like have a bad build.