Can the spelling checker be trusted?

[Jenny Greenleaf]

FM 9, fully patched. Running in a VM under Fusion on a MacBook Pro.

Yikes!

I was preparing a book for PDF production when I noticed a spelling error: include was spelled "imclude".  I knew I had spell-checked the book numerous times and didn't understand why this was still there.

I tried a few things:

Starting from a file at the beginning of the book, did Spell Check for entire book. Did not find error.

Starting from first page of the chapter that contained the error, did Spell Check for the document. Did not find the error.

Positioned the cursor in the same sentence as the error and did Spell Check.  Found the error. 

I have been caught off-guard a couple of times with typos in the past few months. As a result, I've been especially diligent about running the spelling checker. I am not sure what to think about this, but my confidence in the spelling checker is declining rapidly. 

I am not thrilled about checking every page in a book. 

Any ideas what would cause this?  The word in question is in the first line of a page and the paragraph has an anchored frame. Other than that, it's just a word in a sentence.

Jenny Greenleaf
Portland, OR