Colorbox module has no effect
I am not familiar with the flickr integration, but in the included colorbox.js file, it appears that colorbox is looking for images with the .colorbox class. 

Have you tried adding the .colorbox class to the img elements in that view? It's possible that the class may have beren removed by a drupal filter. 

The relevant Javascript: 

 $('a, area, input', context)
      .filter('.colorbox') // target class
      .once('init-colorbox')
      .colorbox(settings.colorbox);
  }