Doh! Sure enough!
Good eye, Alexey. Big thanks for applying it :)
Next lesson learned, in order to get one tooltip per hotspot in an HTML5 browser and one tooltip per hotspot in a Flash browser (not two), you need the following bits:
Code
<!-- the 'tooltip' style - show tooltip textfield and update positions as long as hovering -->
<style name="tooltip"
onover="copy(layer[tooltip].html, tooltip);
set(layer[tooltip].visible, true);
tween(layer[tooltip].alpha, 1.0, 0.5);
asyncloop(hovering, copy(layer[tooltip].x,mouse.stagex); copy(layer[tooltip].y,mouse.stagey); );"
onout="tween(layer[tooltip].alpha, 0.0, 0.25, default, set(layer[tooltip].visible,false), copy(layer[tooltip].x,mouse.stagex); copy(layer[tooltip].y,mouse.stagey); );"
/>
<!-- the 'tooltip' textfield-->
<layer name="tooltip" keep="true"
url="%SWFPATH%/plugins/textfield.swf"
parent="STAGE"
visible="false" alpha="0"
enabled="false"
align="lefttop"
edge="bottom"
oy="-2"
width="200"
autoheight="true"
background="false" backgroundcolor="0xFFFFFF" backgroundalpha="1.0"
border="false" bordercolor="0x000000" borderalpha="1.0"
borderwidth="1.0" roundedge="0"
shadow="0.0" shadowrange="4.0" shadowangle="45" shadowcolor="0x000000" shadowalpha="1.0"
textshadow="1" textshadowrange="6.0" textshadowangle="90" textshadowcolor="0x000000" textshadowalpha="1.0"
css="text-align:center; color:#FFFFFF; font-family:Arial; font-weight:bold; font-size:14px;"
html=""
/>
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plus the call of the tooltip style (my typo above)
and the showttext() function ignored via settings like tooltips_hotspots="false"
Can anyone offer any pointers on a template that inserts linked scene titles into the hover text field?