Condition Indicator Inconsistent Error Message --- But All Book Files Have Same Settings!

Help! I have used the same FrameMaker files for over 2 years in a book and all files have conditional text (CT) tags applied. I added a new one today and now every time I update the book, a Book Error Report says that a condition indicator for one of my older tags (not the new one) is inconsistent --- but what is strange is, I checked the CT tags in each file in the book, and they ALL have the same exact settings, which are "Show All" and "Show Condition Indicators." Can someone help? I have saved the file as an MIF, turned the indicators off and then on, and still cannot get this fixed --- any help from anyone would be very much appreciated. Thank you.