Framemaker Conditional Text Color works sometimes, sometimes not

I inherited a book from a previous writer that has two conditional tags defined: 1) Instructor view, 2) Student view. The instructor text condition is defined to display in orange. This works perfectly in all chapters of the book except one, and yet the condition definitions are identical in all chapters/files. Am I missing something really obvious? This is my first time using conditional text. I'm version 11. Thanks for any help.