There is a template file that has a hard coded http:// protocol.
Here is the patch to fix this issue.
Thanks, I will apply the patch and create a new version for both D6 and D7.
* Applied patch provided by tomfriedhoff in 7.x-1.3: http://drupal.org/node/1617782
* Adpated patch for D6 in 6.x-1.4: http://drupal.org/node/1617790
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