Perhaps the culprit?
Chris Wienandt points out a quirk in Word that could lead to all kinds of spell-check problems:
I don't know what program Dow Jones uses for writing and editing, but any place that uses Microsoft Word or a variation of it (as we do in CCI at The Dallas Morning News) should be aware of a nasty "feature":
Word will automatically change spellings without your realizing it if you have a certain option selected. Unfortunately, this option isn't under the Spelling and Grammar section of Tools. It's called "Automatically use suggestions from the spelling checker," and it's under the Tools-AutoCorrect menu, cleverly hidden away under the list of entries, away from all the other checkboxes. TURN IT OFF! It's very dangerous.