I have D-Link DIR-655 gigabit router. Among other network devices I have a media PC, work PC and WDTV Live Plus. My media PC is 6 years old and all the drives are up to date. My work PC is year old and all drivers are up to date. Router is 3 years old and firmware is up to date. Here is my problem. My media PC is on all the time. My work PC is on only rarely as I usually just use laptop. When my media PC is on and work PC is off I can stream anything to WDTV from any computer on the network. When I turn my work PC on I can still stream from any computer (including work PC) but the media PC. I can see it on the WDTV menu but it is not accessible. When I turn the work PC off I have to restart my media PC for it to become accessible by WDTV again. Media PC and Work are only connected over the network. I can not figure out what this is happening. I was thinking about getting a new network card for media PC. Thoughts?