I just installed the Slingbox Pro HD which I bought in the USA and brought to Romania so my wife could watch TV in USA from her country Romania. Long story short while in Romania I hooked everything up using COAX with a Converter... TV works just fine sound and all but over the internet I can't get any sound... I checked on several computers I checked back home confirming no sound there. Any suggestions?
What I understand from your post, is that you can't get any audio when using the Internet Viewing feature.
In this case, I would recommend to test a different Audio and Video source to discard the current one as a potential issue, all of this since is working fine from home then shouldn't be a problem from a remote location.