setPrefixedCookie: Can't set cookie, headers already sent!

Hi wolf66, 

The issue related to content being loaded on the page before headers were being sent, this post has a description of the issue:

http://www.interactivetools.com/forum/forum-posts.php?postNum=2238265#post2238265

I'd suggest searching the page the issue is happening on and removing any white space before the viewer_functions.php file loads. 

If you can't resolve the issue, we can take a look if you raise a second level support request here:

http://www.interactivetools.com/support/email_support_form.php

Thanks,

Greg