Drupal Technical
[SOLVED][Drupal Colorbox] Colorbox has a white flashing background when loading iframe content.
Many Drupal users had reported that Colorbox has a white flashing background when loading iframe content before reverting to the default black. If you are facing the same issue in Colorbox in your Drupal site then read on to find out the solution.
The problem can often be traced to the default CSS files of the Colorbox module. Check with the CSS files of the Colorbox module and it should solve the issue for you
Hope that helps.
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Reference: http://drupal.org/node/1360400