I don't know if this actually a bug or not but in the .498 version, BS would play any AC3 movie using both my Cyberlink codec (which includes LFE support) and my AC3 Filter (which keeps the audio in sync faster when seeking). In the 499 version, despite asking it to use Cyberlink for decoding, BS will only use AC3 and so I miss out on getting LFE enabled when Cyberlink was also used.