Outgoing PM's not showing in "Sent" folder.

[Tony Ferrari]

Dave

You need to tick the box at the bottom of the page

Save a copy of this message in your Sent Items folder

[Dave Baxter]

What box Tony? All I see are submit and review. Review does as expected, Submit seems to er, "Submit" it somewhere, and I get no errors or warnings. So, what gives.
Using FireFox V20.0.1 if that makes any difference. Scripting enabled for the site.

Dave.