It sounds like the default a:link color is what's getting you. To test this, find a:link in your css file and change it to something else, then reload the page.
If it turns out to be true that a:link is the problem, and I'm not sure how others do it...but I would create a separate css class for those links and then change it to the correct class on the page that displays them.
Try something like:
a.mylinktype { text-decoration: none; color: #ffffff; }
a.mylinktype:active { text-decoration: none; color: #66ff66; }
a.mylinktype:visited { text-decoration: none; color: #66ff66; }
a.mylinktype:hover { text-decoration: underline; color: #00ff00; }
It wouldn't be a bad idea to flip through several pages of your forum and make sure that there aren't similar problems elsewhere. Create another class if you have to, or use the one you just created if it fits in there.
Good luck!
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