Any known problems with sound on 1.19-pr3 - chrome/firefox on Mac only

Hi All

strange problem...

I'm using the sound plugin:

<!-- load sound plugin -->

<plugin name="soundinterface"
url="../plugins/soundinterface.swf"
alturl="../plugins/soundinterface.js"
keep="true"
onloaded=""
/>

then calling it within a hotspot:

<hotspot name="octopus" style="letter" devices="desktop|tablet"
onhover="showtext(Octopus, STYLE4);"
onover="playsound(sound,mp3/octopus.mp3);"
onout="stopsound(sound);"
onclick="plugin[ga].trackpageview(links/octopus);openurl(links/octopus.htm)"
>

<point ath="-46.355173" atv="47.265027" />
<point ath="-42.116122" atv="40.786678" />
<point ath="-36.27729" atv="38.254789" />
<point ath="-27.980433" atv="37.553536" />
<point ath="-22.19712" atv="39.185359" />
<point ath="-17.721993" atv="43.70486" />
<point ath="-18.115965" atv="48.821956" />
<point ath="-20.764647" atv="51.505855" />
<point ath="-32.25151" atv="53.901846" />
<point ath="-43.987796" atv="51.196852" />

</hotspot>

All works fine when I test it across desktop (windows, chrome, firefox, IE) and tablet (Ios). But client gets following error on firefox and chrome on a Mac:

WARNING: unknown action:playsound

WARNING: unknown action:stopsound

ERROR: soundinterface - loading of mp3/tv.mp3 failed!

I tried it on Mac with Safari and it worked fine?

Any ideas?

Thanks

TIm

noticed in log they are running chrome 31, I'm not a mac user but on windows I'm on version 50, so problem may be old chrome browser!