I have a USB DAC that I use for listening to music with headphones. Normally I keep it plugged into USB all the time and turned off when I'm not using it. For watching videos or anything else I just let the sound play out of my laptop's speakers. Now for some reason, if I try to open a video with Movie Player, no sound comes out. I noticed that if I unplug the DAC, then Movie Player will output sound to the laptop speakers, but when the DAC is plugged in, Movie Player will not output sound to the laptop speakers, even though I have them set as the default in sound preferences. I still get sound out of everything else except for Movie Player. I never had this problem until a few days ago. How can I get Movie Player to output sound to the laptop speakers even while the USB DAC is plugged in? Thanks.