I has LG 32LM6200 and it sees the WDTV Live Hub DLNA server perfectly every time I open Smartshare. At times, I move the WDTV Live Hub from room-to-room and there is never a problem playing media either through direct connection (i.e. HDMI, composite, or component inputs) or DLNA.
However, if I had to take a guess, check your router settings if your on a wireless connection. Firewalls can be a SoB and many times they are the problem that causes wireless networks to isolate themselves from the rest of the Universe.
