Drupal Technical
[SOLVED][Drupal Colorbox] Colorbox has a black background
A few Drupal users have reported that Colorbox has a black background after it has been opened successfully the first time in their Drupal site. If you are encountering the same situation with Colorbox in your Drupal site then read on to know the solution.
Here is the solution. Simply add "class=colorbox-load rel=iframe" to your link and this will solve the issue.
Hope that helps.
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Reference: http://drupal.org/node/1536662