I've done as I have always done with the other version a static text, I choose a part of the text and click on the subscript button… When I test my animation, nothing ! and a message saying the property subscript can't work because the html properties can't cope with subscript properties ???!!!!!
you're publishing for html canvas and that property is not (and, never has been) supported.
Subscript is working correctly in exported swf. Could you please explain steps you followed to create this animation.