The 64-bit 13.1 drivers apparently had a bug with the HDMI audio driver. The installer has since been updated with the fixed driver so you may want to download it again.
http://www.overclock.net/t/1350523/...ecember-19-amd-official-whql/80#post_19080348
http://www.overclock.net/t/1350523/...ecember-19-amd-official-whql/80#post_19080348
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