After installing the latest VU today a number of us noticed that our microphones no longer worked. Apparently the latest VU mutes your microphone. You will need to go into your microphone settings to unmute your microphone. For Windows 7 On your task bar, right click on your speaker icon and select 'Recording Devices'. Select the 'Recording' tab. Right-click on your microphone that you use and select 'Properties'. Highlight the 'Levels' tab and uncheck the 'speaker' box if it's muted. That should fix it!