HTLM not loading in multiple browsers

Hi all,

I'm trying to view an animation of a student of mine and it is not loading in Firefox (32), Chrome (37) or IE (11). It plays fine in Animate CC 2004. It's not doing anything too sophisticated - just a series of pngs. The student has claimed it works on Firefox - an earlier version.

Any thoughts on why it it is not working or what I could do to troubleshoot this? The student has claimed it works on Firefox (earlier version).

Thanks.

Dean