I have trolled everyforum i can think of and found a solution.
Goto Downloads - ps3mediaserver - Project Hosting on Google Code
and download yourself a copy of PS3 Media Server.
I downloaded Version 1.10.51 and have not had a drama.
Glitch free streaming to the ps3.
Make sure PS3 is turned on when Opening the program and mine connected straight away. In the Navigation/Share Settings tab down the bottom of the page is where you add folders to have acsess to.
Hope this works for you