G'day kaiser,
Do you have a Desktop Plus Key as well as you Media Access Key? I believe they work together to allow the transfer from PC to Tivo.
Below is a description from a Tivo Support site - troubleshooting Tivo Desktop Plus Keys:
"What is the TiVo Desktop Plus Key?
The TiVo Desktop Plus Key extends the file transfer and conversion abilities of TiVo Desktop. TiVo Desktop Plus allows you to automatically convert your TiVoToGo transfers to play on a variety of portable devices with video support, including the following:
Apple iPod, Apple iPhone, Apple iPod Touch, Apple iPad
BlackBerry Bold, BlackBerry Curve, BlackBerry Pearl, BlackBerry Storm, BlackBerry Tour
Nokia N80
Palm Pre, Palm Treo 650
Sony Playstation Portable (PSP)
Zune, Zune HD
H.264 compatible devices
MPEG-4 compatible devices
TiVo Desktop Plus also makes it possible to view videos, collected from the web, on your broadband connected TiVo DVR.
Supported formats include:
Windows Media Video (.wmv)
QuickTime Movie (.mov)
MPEG-4/H.264 (.mp4, .m4v, .mp4v)
MPEG-2 (.mpg, .mpeg, .mpe, .mp2, .mp2v, .mpv2)
DivX or Xvid (.avi, .divx)"
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