Are your folders and files shared?
You'll want to make sure that they are with your OS. In the PC Share Manager, refresh and update your list, and then right click on the folders in the shared folder dialoge box. Click "PROPERTY" and then check to make sure it's shared.
If it still doesn't work, it may be a setting issue with your router.
I have a BD-P6900 Blu-ray player. I have installed PC share manager. I can get my files to the share mode but when I try to update a dialogue box comes up in front of the program window that says Server Update please wait while updtaing changes on the PC. It never updates anything. Without the update it will not show on the blu-ray. Is there a way to make this work or am I doing some thing wrong. Is there another program that will do the same thing. This feature was one of the main reasons I bought the TV.