Wow - WHAT a great scenario! Well done!
@klausesser: Thank you!
I view your tour with FF27 on Windows XP/32 I turn off the autorotation the click on the Share button and see this this:
@mediavets: Hmm, very interesting. You discovered another strange thing of my tour. If I view the tour with FF27 on Windows 7 for the first time I see the same screen as you did (see attachment). If I refresh the page, the screen looks different. In fact the second screen shows the social-share-buttons-bar according to my up-to-date tour version. Actually I was thinking that this issue is only visible on my computer because some older files in my cache. I am pretty sure that only the latest files of my tour are on the web server.
On the second attachment you can see my actual problem. The control button is not highlighted when the social-share-buttons-bar is visible. And the button is not working anymore.