Broken Sound

Hi guys,

I'm having a problem and I don't know what to do.  I'm the Network Admin for The Five Star Institute, and we have some online classes that we host on Moodle and run through a flash player.  The same course has been offered for Three years and has NEVER had an audio issue.  We recently hired a new employee and he's got to take the course as part of his job, the slides work, but the audio doesn't.  I know his audio works on other slides and other files but not this particular one and I'm not sure what to do.  Because it was brought to me, I started trouble shooting but I can't hear the audio and neither can one of the other people that I asked to take a look.  All of the computers affected have the latest update to flash.  Can anyone give me any advice here?