Ok my network is as follows.
Router plugged straight into internet connection, no modem. #1 on router plugged into homeplug A, homeplug B connected to PC Gigabit LAN. PS3 connects to network via wifi. I cannot share any content between my PC and my PS3. The PC will find the PS3 via Media Player 11 but it will not connect or share any content. I have the PC and PS3 connecting via static IPs to the router. The router is a DLink DI 524.