Suddenly, I can't import sound

Using Storyboard Pro version 5.1 but just upgraded to 6, because… I could not import sound. Not only that, but files that I had previously imported sound into (several months ago) now will not play their previously imported sound. No WAV files are able to be imported into any Storyboard Pro projects.

What gives? Is anyone else having this issue?

I’m on Mac OS X El Capitan and am running the latest version of Quicktime (since in researching this, I’ve read that can cause some problems).