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This is caused by a bug in very old versions of Internet Explorer (specifically IE6 on Windows XP). The user just needs to update their browser, or use a different browser. When this happens, the user's post has gone through successfully, they'll just need to hit Back and refresh the forum thread to see it.
The other thing is that if they're at work, and it's not likely work-related, they will probably have a lot of trouble with getting their company to update IE or let them use something else. Without getting in trouble for goofing off at work, that is.