This is probaly not related to BSPlayer. But still to confirm open the video in mplayer2.exe. (Both audio streams will play simultaneously.)
The both audio streams might use different audio formats. Your system has correctly configured audio codec only for one of them. What filters are opened when the English audio is selected (context menu -> Options -> Filters)?
Most AC3 files have too low amplitude. Maybe you have an AC3 stream here with amplitude set too high. If this is the case use AC3Filter to decrease.
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