Hi Yangxi,
Am using the HDPro that you first brought in (not the HDPro+)
My setup is
HDPro - Optical -> Yamaha 6.1 Amp (My amp does not support HDMI)
HDPro - HDMI -> Pana Plasma TV
Recently I have been trying some 720p HQ videos and I am having problems with the audio.
There is no sound if I select SPDIF - RAW and it only works with SPDIF LPCM Dual-Channel; but which only gives me stereo

I realise that the audio in the video files (MKV or MP4) that I have problem with is AAC.
Example is the file below
Is this a known issue?? I have tried all these firmware below and still have the same issue.
1) Hdpro_20110108.rar: YG Dec 29 2010(26)
2) Hdpro_20101110.rar: ZF Nov 10 2010(26)
3) Hdpro_20100907.rar: YG Sep 7 2010(26)
4) Hdpro_20100628_oem2.rar: ZF June 28 2010(26)
Click spoiler for mediainfo
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Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 3.25 GiB
Duration : 3h 16mn
Overall bit rate : 2 374 Kbps
Encoded date : UTC 2011-01-15 10:27:44
Tagged date : UTC 2011-01-15 10:27:44
Writing application : Yamb 2.1.0.0 [http://yamb.unite-video.com]
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings, CABAC : Yes
Format settings, ReFrames : 9 frames
Format settings, GOP : N=1
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 3h 16mn
Bit rate mode : Variable
Bit rate : 1 923 Kbps
Maximum bit rate : 5 259 Kbps
Width : 1 280 pixels
Height : 528 pixels
Display aspect ratio : 2.40:1
Frame rate mode : Constant
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.119
Stream size : 2.63 GiB (81%)
Writing library : x264 core 67 r1162M f7bfcfa
Encoding settings : cabac=1 / ref=9 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=7 / psy_rd=1.0:0.0 / mixed_ref=1 / me_range=12 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / chroma_qp_offset=-2 / threads=6 / nr=0 / decimate=1 / mbaff=0 / bframes=3 / b_pyramid=0 / b_adapt=2 / b_bias=0 / direct=3 / wpredb=1 / keyint=250 / keyint_min=25 / scenecut=40 / rc=2pass / bitrate=1923 / ratetol=1.0 / qcomp=0.50 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=24000 / vbv_bufsize=24000 / ip_ratio=1.10 / pb_ratio=1.10 / aq=1:1.00
Language : English
Encoded date : UTC 2011-01-15 10:27:44
Tagged date : UTC 2011-01-15 10:30:39
Audio #1
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 3h 16mn
Bit rate mode : Variable
Bit rate : 128 Kbps
Maximum bit rate : 177 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 179 MiB (5%)
Encoded date : UTC 2011-01-15 10:30:19
Tagged date : UTC 2011-01-15 10:30:39
Audio #2
ID : 3
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 3h 16mn
Bit rate mode : Variable
Bit rate : 318 Kbps
Maximum bit rate : 434 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 446 MiB (13%)
Encoded date : UTC 2011-01-15 10:30:27
Tagged date : UTC 2011-01-15 10:30:39