Hopefully somebody has come across this problem before. I had my system working perfectly using Media Portal but for some odd reason the sound disapeared, after some quick fault checking I found that the sound was still working in windows (Vista) and it was also working when I used the preview button in the TV Server Configuration screen.

Video and everything else works perfectly accept when I'm in the main Media Portal GUI where I have no sound, video is fine. I even tried uninstalling Media Portal and the server albeit keeping the settings, however this failed to work also.

Anybody got any ideas on how to resolve this?