Audio issues

I'm using Lectora 2008. The audio files are MP3. Now, here's the strange part... I researched the issue on the forum and re-published the course without audio compression. The reviewers who couldn't hear the audio could. The reviewers who previously had audio no longer had audio with the uncompressed course.The course was being accessed on a LAN server.I uploaded a version with compressed audio onto a webserver and tested the course. All reviewers had audio with that version.I am at a complete loss why some reviewers have audio when accessing the course via our LAN and some do not.