Welcome Paul. I've moved your post to the Macromedia forum rather than the Xara Xtreme forum (Xara Xtreme Pro has some limited Flash capabilities but your presentation was obviously done in Flash or Swish)

I can confirm that the presentation opens fine in FF but EI7 shows nothing at all. Firstly I would question why you are opening the presentation in another window and not directly in your own site? Opening secondary windows is fraught with problems, not least is pop-up blockers.

I couldn't even hazard a guess at what's causing the problem. It could be the JavaScript but I know nothing about this and it seems to change with boring regularity so no wonder there's cross browser problems.