I took his xml and added my pano into it. I was able to get it working when I removed the context menu block completely and also the two plugins for the sound. Of course, I didn't actually have those plugins installed on my server so that may be part of the issue.
see below.
<plugin name="playbutton" url="on1.png"
keep="false"
visible="true" enabled="true" handcursor="true" capture="true" children="true"
zorder="1"
alpha="0.85" blendmode="normal"
smoothing="true"
origin="righttop" edge="righttop"
x="10" y="25"
width="30" height="30"
scale="1"
onloaded=""
onloaded=""
onover=""
onhover="showtext(Activez le son);"
onout=""
ondown=""
onup=""
onclick="playsound(mymusik,auxarmes2.mp3,loops);"
/>
<plugin name="stopbutton" url="off1.png"
keep="false"
visible="true" enabled="true" handcursor="true" capture="true" children="true"
zorder="1"
alpha="0.85" blendmode="normal"
smoothing="true"
origin="righttop" edge="righttop"
x="10" y="60"
width="30" height="30"
scale="1"
onloaded=""
onover=""
onhover="showtext(Arrêtez le son);"
onout=""
ondown=""
onup=""
onclick="stopsound(mymusik);"
/>
<!-- right-click context menu to change the viewing settings -->
<contextmenu>
<item caption="Création : VUE-360.FR" onclick="openurl(
http://www.vue-360.fr,_blank);"/>
<item caption="FULLSCREEN"/>
<item caption="vue normale" onclick="action(rectview);" separator="true"/>
<item caption="vue fisheye" onclick="action(fisheyeview);"/>
<item caption="vue architecturale" onclick="action(architectural);"/>
<item caption="vue stereographique" onclick="action(stereofisheyeview);"/>
<item caption="vue petite planete" onclick="action(littleplanet);"/>
</contextmenu>