I had a card returned for edits because the reviewer said that my custom text boxes "extending over the yellow safe line in the print margin preview."  However, when I go to fix it, the print preview doesn't show up.  I just get a blue swirl and the words Creating Card Preview.
 
I've tried to look for an answer, but am unable to find a solution.  I'm willing to fix the card, but its hard without being able to see the yellow safe lines!  
 
Thanks in advance for your help.