In the meantime, you can turn it off in your forum, from your Admin Options. They might fix it somewhere in the near future. It's only been a month since we noticed it.
I have also found faults with AOL and very often Yahoo, with the message feature on my page.
What I have done, in profiles it to just simply display whatever their address is. Rather than it opening up in a popup window which doesnt always work. Just a thought for the future?