Hmm... Yup, that affects all of the Mastermind primary sets due to the fact that template is used to document summoned henchmen and their training powers. Some of the Controller and Dominator sets with pets are also affected.
Edit: Ah. I see the problem. The templates are currently called with "Header" and "Text" parameters. The templates are now expecting "header" and "text" parameters without the first letter capitalized.
Edit2: A couple of quick little tweaks and I think everything is all fixed up now.