I am not sure if spell checking is part of the program or maybe I have a plug in that is causing this but here is the symptom.
If you are editing a page, and find a misspelled word in the field properties, you can right click and change it. This is a great feature, however when you go to save it, it does not correct the misspelled word (it keeps the old word).
You have to manually change it, retype the misspelled word. Then hit save, and it will be fixed.
machform v6 chrome 61.0.3163 win10-64 10.0.15063