It sure does sound like some type of Keyword Scripting!
Don't have that problem on my end - all Browsers are Netscape, but have viewed the Forums with IE many times (IE used for uploads).
Some crazy Spamming technique at work here!
As normal, for any user's message to include "Intentional" Hyperlinks, that user will need to enclose within URL Tags.
Steve (Sparky);
Next time you view a threaded reply which someone's message has been tweeked this way, read it in an "Edit Message Window" (the reply message with the fraudulent link is active, click on the "Edit" Icon).
See if the term/word has straight HTML tags, or the more commonly used UBB tags.
Also see if there's any "Hosting" identification which is common to other fraudulent links.
If you see straight HTML tags, this would be done outside of the Forum - unless that user prefers HTML code vs the common UBB code. Might be worth asking that user.
If you find a common host site, then we have a WEENIER!!! (Winner).
Maybe some form of deliberate ASCII Bomb would be in order for such a site
At least, a complaint may be issued.
Scott35