The problem is not with vBulletin, and I can not see the Greek on your page, bibliophage. I tried making the following HTML document:
<HTML><Body>
<Font Face=“Symbol”>This is a test</Font>
</Body></HTML>
And, the text showed up in Times, just like here, and just like on that page you linked me to. Out of curiosity, I tried replacing “Symbol” with every font that Character Map says I have. The following fonts worked like you would expect them to:
Arial, Arial Black, Arial Narrow, Arial Unicode MS, Batang, Book Antiqua, Bookman Old Style, Century, Century Gothic, Comic Sans MS, Courier, Courier New, Fixedsys, Garamond, Haettenschweiler, Impact, Lucida Console, Monotype Corsiva, MS Sans Serif, MS Serif, PMingLiU, SimSun, Small Fonts, System, Tahoma, Trebuchet MS, Verdana, Webdings, and Wingdings.
The following fonts did not work, and instead reverted to the default font:
Marlett, NWCV15, Symbol, Terminal, Wingdings 2, and Wingdings 3.
I’m trying to find the pattern. All of the fonts in the second category do not follow Windows ASCII standard. Terminal comes closest, but its extended ASCII is that of DOS. Furthermore, all of the fonts in the first category do follow Windows ASCII standard, with the exceptions of Webdings and Wingdings.
I tried searching on the Internet for an explanation as to why Netscape 6 would do this, but no luck so far.