Can't import M2TS with LPCM audio. Video OK, Audio not.

I have M2TS file with H.264 1440x1080i 29.97 25Mbps CBR video stream and 2-channel LPCM Audio stream. When I import the file to Premiere or Encore, the video comes up ok, buth the audio portion sounds like static noise. If I demux the M2TS file into *.M4V video file and *.WAV audio file and import them seperately and then join on the timeline everything works just fine. Any suggestions?
Also, not sure if it's related, but the M2TS file has a choppy/blocky playback in the preview monitor. When stepping manually frame by frame everything looks OK. If I export the M2TS file, the video playback is good. I've seen other people posting about the same problem, so I assume this is a common problem and all I can do is wait for some updates, correct?
My PC Specs: Q6600, 8GB Ram, Quadro FX580, Vista64bit

The material comes from CS4 media encoder output. This is how.
Master Source Clips: HDV 1440x1080i, 29.97
Edited in CS4 and output via media encoder to
H.264, 1440x1080i, 29.97, Upper, High 4.1, CBR 25Mbps, LPCM, No Muxing
After the encode M4V and WAV streams muxed into M2TS via TSMuxer.
I then took the file and tried to import it to Premiere and let it conform. That's where I experience the problem.
I just tried another test. I took the original HDV project and exported via the same settings (explained above), except I've changed LPCM to AC3. This time the audio plays fine in Premiere. So it sounds like Premiere does not like LPCM inside of M2TS.
Regarding the video playback, the weird thing is that when I preview the file in premiere and it's blocky (just a little bit), my CPU utilization shows only about 20%. I would have thought that if my machine couldn't keep up it would be higher. Btw. playback of H.264 outside of Premiere is superb, also only with small CPU usage.
I generate the M2TS H.264 output for two reasons:
1. Playback via PC and PS3
2. Have a reasonably small and high quality backup copy of the project output. Since there is no losless HDV export, I figured H.264 export at 25Mbps is a better alternative then MPEG2 25Mbps export. I'm not considering any 3rd party plugins or losless codecs, etc. Just trying to have something reasonable for non-pro use.
The M2TS file allows me to accomplish both 1) and 2) with one file. I also backup my project file and HDV source, but it's good to know that I have an additional backup in the compiled M2TS file.
I'm testing the M2TS editing in case I do ever loose the orignal project files and need to resort to M2TS editing.

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