Premiere 7 - stereo sound exports without one audio channel

Hi there.
I have a strange problem with Adobe Premiere 7.0.
Every time I export a wideo it looses one audio channel - the right one. I have no idea why.
I have a stereo audio file in my Timeline and it plays in stereo during editing.
I choose stereo sound for export, try different codecs and formats but nothing helps. After rendering the movie lacks the right audio channel.
I've double-checked the source audio file in GoldWave - it does have the sound in both channels.
Then I've double-checked the audio from the rendered movie - no right channel.
What might be the source of this problem?
Thank you for you help.
Best regards,
Szymon.

Thank you for your answer A.T.
The screens were from the GoldWave program (similar to Audacity). I've checked the original and rendered versions in Adobre Premiere. The rendered one does not have audio channel.
Source audio: wav, 24 bit PCM, 2 channels, 44100 Hz (but it happens with every audio I've tried).
Project Settings:
HDTV 720p, 25 fps
audio 48000 Hz
Export settings:
MPEG2 PAL 720p 25 fps MainConcept MPEG Video codec
Audio MPEG, MainConcept MPEG Audio codec, MPEG-1, Layer II Audio, Stereo mode, 16 bit, 48 Hz, 384 kbps bitrate
Hardware I'm working on
Lenovo Y550
OS - Windows 7 32 bit
Intel T6600 2,20 Ghz CPU
4GB of RAM
Realtek High Definition Audio
Codecs installed:
CamStudio Lossless Codes v.1.5
K-Lite Codec Pack 9.4.0
Xvix MPEG 4 video Codec
ffdshow audio decoder
Haali Media Splitter

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