Fatal Error when trying to add Closed Caption and/or Slide Notes

As the subject says, I get a fatal error everytime I click on the plus sign to add closed captioning (CC) and/or slide notes.  I select the section of audio for which I want to add the CC, click the plus, and POW!  Fatal error everytime.  I've tried this on multiple projects.  I even created a new blank project, added an audio clip, and attempted to add CC to no avail.  I'm using version 11.5.0.476.  Trying to get our admins to update to the latest version to see if this will fix it, but I doubt it as I cannot find anyone with a similar post.  Any help would be appreciated.