Can't type into header box on parent page
I've been away from ID for a while, now using it again. I used to make running headers by creating a text box on the parent page(s). Now, I try to do that, and when I type into the created header box, i can't see the text. I tried resizing fonts, enlarging the box, etc, and NO TEXT APPEARS AT ALL, like I'm not even typing anything. I tried resizing the main text boxes to be shorter, allowing a space for the header box, to no avail, and I tried to use the running header variable text thing (new to me) but had no luck with that, either.
What am I doing wrong?

