At ${WORK} we frequently work in collaborative documents using (shudder) MS-Word. The little red squiggly line often indicates spelling mistakes, and frequently marks technical jargon it doesn't understand.
Sometimes it misses obvious spelling mistakes, but checking in your local dictionary is not the way to fix it.
In this document, three different types of errors are imbedded in the document, and would need to be removed.



How?
1. Has a separate Style applied, which has "Do not check spelling" applied to it.
2. "Do not check spelling" is applied to a selection (the first instance of "fxt")
3. The word "spolling" was added to the ignore list for that document ("Ignore all"; then save document).

Fix:
Any new document that you receive from someone else ... (a real pain):
Tools - Options - "Spelling & Grammar" - "Recheck document" (fixes 3)
"Select all" - Tools - Language - "Set Language" - "deselect 'Do not check spelling or grammar'" (fixes 2)
Review any unusual styles attached to document.

Complain VERY LOADLY about the poor spelling skills of your co-workers.