Weird glitch in conversation with Liara (Shepard's looking at the wrong character)

Upon further examination I seem to be missing voiceovers for all shuttlebay conversations with Vega.  Both Shepard and Vega seem to be mute:  subtitles but no voice.

I'm trying a reinstall.  I had a hardware glitch during the initial install (lost track of the hard drive, I suspect due to thermal expansion pushing the plug loose), and I'll let y'all know if it fixes it.