
I can't FF or RW either.  I just got this unit 3 days ago and it came with firmware 1.01.  When I tried to FF or RW, the video won't perform such action.  As matter of fact, it would start rewinding it when I prerss FF and vise versa. What kind of crap is that?    I installed Tversity on PC and the same video performed OK when I saw it from the MediaLounge under "My Media" and  I was able to FF/RW.  
I am using my unit in MediaLounge mode and my videos are in a Bufffalo Linkstation Mini 500GB NAS in a Wireless N network.