THE reply from tech support, besides the usual "thank you's" and "we're sorry":
We are aware of the problems you are experiencing with the notes in Family Tree Maker. Our developers have been notified of the matter you have reported. We have come up with a solution to solve this issue while work fix the error in the program. You will need to cut the notes out of Family Tree Maker and paste them in a Word document. You can then paste the notes back into Family Tree Maker.
Not very helpful for a tree with 12,816 people!