errors can't be found in document

[Grundoon Groundhog]

Apparently there are overflowing text boxes in my document, but there's no warning before exporting it to a PDF (which it does with no problem).  The preflight panel does not include the suspect page. How do I find the page number where the problem is supposedly occuring?

 

[leo.r]

First, expand the Overset text entry (click the > sign) - what do you see there?