Document update causing a "Book is not self-consistent" message

I'm using FrameMaker 13, as a part of Adobe TCS. I have created a book in standard Frame, no structured content. Track Edits has never been used with this content.

The book was generating fine without complaint until this morning (4/13/2016) after Adobe applied updates to TCS. Now I see a "Book is not self-consistent" message. After reading some other posts, I experimented with the Update box and discovered that it's the cross-reference update that's causing the problem. I went through the book (which is only about 20 pages) and replaced all the cross-references. I still get the message.

It would seem obvious that the updates caused the problem. Does anyone know a solution?

Thanks.