There is a bug in fast-forwarding and rewinding Variable Bit Rate (VBR) files in the current version of the software.
It is a bug in the XAudio decoding engine they licensed for the player, they can't fix it without replacing the audio decoding engine.
Good thing is, version 1.1 (due out soon) will have a completely new audio decoding engine which fast-forwards and rewinds correctly on variable bit rate files.
In the meantime, fast-forward and rewind still work fine on Constant Bit Rate (CBR) files.
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Tony Fabris