I was only able to find one reference to this problem when doing a newsgroup search
<a href="http://groups.google.com/groups?hl=en&th=d07ca778d4e5bb7c&rnum=1" target="_blank">http://groups.google.com/groups?hl=en&th=d07ca778d4e5bb7c&rnum=1</a>
In this case the problem was gravis experience beta software. So if you're running that, try unistalling it. If not, who knows?