It happens to me in this thread. Banner on top: Verizon. Below: "Find Online Universities". A new window is spawned even when I click the Forum Jump button. In fact, every single link on the page tells me "... in new window".
Safari 1.2.4 (v125.12)
Nothing for the latest full releases of FF or Camino
MWSF '07: Steve Jobs hates my wallet and my mobile carrier.