It seems that the forum software is being too smart. My numeric entities got converted to quote characters. By now, everyone should know where to go to find a table of extended characters, so it doesn't matter.
I don't remember the exact circumstances, but I did have display problems when using either the UTF-8 characters themselves, or the named entities. I have never had a problem using the numeric entities. It may simply be a matter of the various reading softwares not following spec.
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