title: OpenCV cvNamedWindow not appearing under Fedora
body: <p>As the title suggests I'm simply trying to get a named window to come up. I've been working with OpenCV for over a year now, and never had this problem before. For some reason, the window never opens. I've tried running some of my old scripts and everything works fine.</p>
  
  <p>As a very cut down example, see below</p>
  
  <pre><code>#include "cv.h"
  #include "highgui.h"
  
  int main(int argc, char** argv) {
  
      cvNamedWindow( "video", 0 );
      IplImage *im = cvCreateImage( cvSize(200,200), 8, 3 );
      while(1) {
          cvShowImage( "video", im );
      }
  
      return 0;
  }
  </code></pre>
  
  <p>I can see no reason why that wouldn't work, but for some reason the window never appears.
  Has anyone else experienced this? It's doing my head in!</p>