Exactly! at first it did not work with hers either

then I notice the greyed-out Q - the Quicktime thingie. So I figure that Window Media Player must be ousted as a default and now my PC does not have default player. Had to google to find out how to re-set Media Player as default. After that, hers and others all play fine, except yours.

Yours wont move at all despite I manually click the play button. Really weird.