I highly recommend re-running your X-Plane Installer. This will scan through all files in the X-Plane 10 and, hopefully, will detect missing, corrupt, or modified root files. It is possible, if this is not your operating system, that some audio file has been corrupted in association to X-Plane 10.
Your easiest and best bet would be to run the installer, selecting the "Update/Repair" button.
If this does not solve your problem, please post a copy of your log.txt as soon as you exit X-Plane.
Hope this helped! If this solves your problem, make sure to checkmark it as the answer!