So I'm fairly new to Vegas MS15. All seems to be working fine but I notice after creating a movie, Vegas MS seems to lose sync with my system soundcard. Playback does not work (an error message pops up). Shutting down and reopening Vegas solves the problem until I create another movie and same routine. Even though Vegas stops working I can still use Media Player or VLC. So it doesn't seem like anything wrong with the system. Any ideas? Just to confirm, all I'm doing is creating an MP4 file on my computer hard drive. Thanks!