Exclamation mark says text too long...but it's not

Question

My captions are 2 lines long, and they fit in the caption box. But I get an exclamation mark anyway -- the text warning that means (I think) "text too long."
When I print the book on my color printer, all the text appears just fine.
So here's question 1: If I try to send a book with text warnings, will Apple reject the file until I have made the warnings go away?
And question 2: If the captions print just fine on my printer, are they likely to print just fine at Apple?
Many thanks!

Answer 1

When you order the book, a PDF will be created. That PDF is what gets uploaded to Apple (via Kodak) for printing. So the best way to check your book before ordering is to create a PDF, then inspect it. Chances are, what you see in your PDF is what you will get printed.
To do this, select your book and do File > Print. You'll get an "Assembling book" progress bar. That can take several minutes. When done, you get the Print Dialog box. Click the PDF button and choose "Save as PDF..." Choose a name and location for the file (the Desktop is convenient) and Save. Then switch to the Finder and open that PDF in Preview.
While I have not observed (or even tried to observe) for myself, I have read here from others that the PDF created this way may differ slightly from the one created by selecting Preview in the first Print dialog, and that it will more closely predict the final ordered book.
My captions are 2 lines long, and they fit in the caption box. But I get an exclamation mark anyway -- the text warning that means (I think) "text too long."
I have that warning on one of my text boxes, too. It looks fine in iPhoto, fine in the PDF, and printed fine when I ordered the book from Apple.
Regards.