Can't click on the msn account button

In songbird, I try to add an MSN account. But in the account wizard window, when I click on the MSN button, nothing happens. It is the same for Twitter and AIM. Both have a non encrypted connection (that what the window under the cursor says when I put the cursor on the button).
Is there any security parameter in Songbird I didn't found, closing me the acces to MSN account creation ?

Thanks for your answer.