Beta Build 659 has been posted.
1) Fixed beta notification, should no longer keep notifying you after you've installed new beta.
2) Fix audio output issue when authoring DVD and converting from AC3 / AAC to Mpeg1 Layer 2.
3) When adding to joiner, both audio and video mismatches are reported at the same time.
4) When recoding video, if the dimensions change, the video recoder will resize the changed dimensions to the desired output dimensions.