If you see something like this, you should double check the language that is selected for your file. That is the language the spell check is going to use to check your document. You can check this by clicking on the "File" menu across the top of your screen, and then clicking on "Language" about halfway down the list.
Make sure that "English (United States)" is selected. Once you do that, chances are all the little red underlines will clear and peace will be restored.
Ahhh. That's better, right? I have no idea how Afrikaans got selected on my colleague's document, but I'm glad that choosing the correct language fixed the problem. You might not run into this issue, but I bet your students might at some point. It is easy to accidentally click on something with those little fingers on the track pad.
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