Hi I have the same problem, Dude!
When first installed, I have successfully connected the PS3 and the Linkstation...it played movies perfectly...
One day , I have rebooted the Linkstation...and since...it does not work anymore..PS3 does not see Linkstation, and Linkstation does not see PS3...I believe the DLNA does not work properly.
I have upgraded PS3 with new firmware 3.41 and Linkstation with its last Firmware 1.33, in case it fixe the DLNA...but no success...
What is your firmware for Linkstation and PS3? I think it is a DLNA problem, there is probably a bug or an uncompatible DLNA between both...because PS3 can see my PC but not the Linkstation...a bug in the PS3 or in the Linkstation.
It is interesting to know if others users have seen such thing...?
I'm waiting to see if someone can fixe it and want to share..or maybe a new firmware fromBuffalo or PS3?
I'm also desesperate...it was great when it worked :(
Cheers