Total newbie here...just installed my Slingbox 500. Have STB component video, audio and HDMI going to the Slingbox, and HDMI out to my TV. Getting fine video/audio on the TV, but the Slingbox viewers (tried the browser and the iPad app) are not getting any sound at all. Same issue on my local network or remote. Tried FIXED and VARIABLE on the STB settings - no difference.