Yes. 1.00.36 is currenly the latest firmware.
Have you tried Windows Media Player 11 as the media server for WMV9 video playback? Is this a wireless connection?
Yes I have tried WMP 11 as the media server with the same results for both wired and wireless connections.
Some videos encoded as WMV3 played with little or no stuttering while others would not play, also WVC1 encoded videos give the most problems. I have also tried the direct way (USB connection), with the same results, some will play and some would not (for both, WMV3 and WVC1 encoded videos).
I did some research and found out that the Linksys models (2100/2200) were having these same issues and was fixed with a firmware update....
http://thegreenbutton.com/forums/2/235767/ShowThread.aspx