title: Bootstrap navbar only working after resize with IE9
body: <p>I am helping a friend with the design of his homepage using bootstrap 3. Now the design is almost ready, but we have come across a strange behaviour of the navbar at the bottom of the page when accessing the page with IE9. As usual there are four sizes defined (large, medium, small, xtrasmall). If the page is loaded for the first time with IE9 in large or medium size, the navbar does not work. Only after re-sizing the window to at least small or xtrasmall the navbar works - even in large or medium.</p>
  
  <p>With Chrome, FF or Safari, everything works fine.</p>
  
  <p>Any idea, how we could fix the behaviour?
  website:
  www.theballroomshow.com</p>
  
  <p>Bernhard</p>