It's definitely not due to older builds or FS2 being installed as none were on this system before this version. I'm going to try running it with Hardware audio selected rather than the recommend software sound drivers that get installed with it.

I'm also now downloading the current BSG: Beyond the Red Line patch to see what is updated. Looking forward to this and can't wait for this to be completed. Have you seen that BtRL won the 2007 Mod of the year award?