Audio not playing in published content
I'm creating an e-learning module with embedded .mp3 audio, using Storyline 3. I've published into HTML5 only and HTML5/Flash, and for some reason audio wouldn't play on some computers when the module is viewed in the LMS. It does work fine when viewed from other computers though. The browser used is Firefox. Does anyone have any idea about why this might be, or what browser or any other settings can cause this?
Thanks for your help!