1. Anna - you didn't buy this module, you bought the Youtube Playlist module. This is the single Youtube video module!!!
3. Just to correct you - this module was purchased by you a week ago, not a couple.
And lastly, as a web designer/developer you should really know how to find the conflicts that 'your' template is causing.
My advise would be not to blame the creator of an extension until you know what you are talking about. This module & the Playlist module has many, many happy users - who also know what they are doing & enable it on 'good' templates.