It doesn't disappear unless you click it away as you say Jay, but it is on the top of the board, and it is not an obvious place to look for a message after you have been fiddling on the middle of the screen entering your email address and password.
I think the message should be in the centre of the screen, or as a popup. The way it works now it looks like you are ready to log in after you have registered. And then users start emailing me saying it's not working.
A solution would be that when they have registered they're not sent back to the login screen, but to a message screen.
I have already lost some potential clients, as they have grown cold due to such minor obstacles.
Andres