Many of your selection buttons (Yes, Enter or Cancel etc.) do not have any text to show their function. They appear as white "Aqua" style buttons.
This is an issue in Camino on the Mac (and most probably Safari 2.x) and appears to be a problem related to the use of button graphics rather than standard buttons. It occurs on the top search "Go" button (which should probably be labeled "Search" for usability), the "Reply to this topic" button, "Search topics" and the "Suggest an answer" form.
