MPEG-2 file with AC3 5.1 audio: no audio (neither in current video playback, nor after encode), but plays okay in QuickTime X

Mavericks 10.9.3
Latest Mac Mini, 8GB RAM, two 256GB SSD
Compressor 4.1.1
I have an MPEG-2 file with AC3 5.1 audio which plays in QuickTime X as expected.
I have a second MacBook Pro with Compressor 4.1.1, where the audio is fine - both as current video playback of the source, and post-encode using Apple Devices HD (best quality) setting.
However in the Mac Mini Compressor there is no audio (neither in current video playback of the source, nor after encode using Apple Devices HD (best quality) setting).
Troubleshooting
- main difference between machines is the Mac Mini has Elgato software (EyeTV and Game Capture HD)
- I've checked the QuickTime components are same on both machines, except for EyeTV audio component on Mac Mini
- there are no plug-in audio components
- I've repaired permissions using Disk Utility
- I moved Compressor to trash, deleted compressor plist files, and reinstalled

MediaInfo trace:
General
Complete name : /Users/tester/Movies/export-tests/test24trailer.mpg
Format : MPEG-PS
File size : 12.9 MiB
Duration : 12s 576ms
Overall bit rate mode : Variable
Overall bit rate : 8 614 Kbps
Video
ID : 224 (0xE0)
Format : MPEG Video
Format version : Version 2
Format profile : Main@High
Format settings, BVOP : Yes
Format settings, Matrix : Default
Format settings, GOP : Variable
Duration : 12s 533ms
Bit rate mode : Variable
Bit rate : 7 995 Kbps
Maximum bit rate : 38.8 Mbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Active Format Description : Letterbox 16:9 image
Frame rate : 59.940 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.145
Stream size : 11.9 MiB (92%)
Audio
ID : 189 (0xBD)-128 (0x80)
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Muxing mode : DVD-Video
Duration : 12s 576ms
Bit rate mode : Constant
Bit rate : 448 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 688 KiB (5%)

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