Yes, this is for real... You type into a "rich text " field, and seemingly some letters (like 'm', 'k', '-') do not seem to appear!

This is an intermittent error that a few people have reported. Over the years, it has come and gone as well.
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If you could do me a favor and try this test editor out: Basic Froala Editor jsFiddle - JSFiddle

And let me (jonk@blazemark.com) know if typing works there or not.
The editor we use is in use by thousands, maybe millions of people. So it is some weird combination of planet alignments, or something I do not fully understand.