[Dovecot] Mail.app & Subscriptions

[Neil]

Client: Mail.app v.3.5
Server: Dovecot 1.1.6

I've noticed that when I go to "Account Info" in Mail.app, and then to  
the "Subscription List" tab, Mail.app will spin for a bit, and then  
give up, without showing any folders and all the buttons are grayed out.

Does anyone know if this a Mail.app issue or a Dovecot issue, if  
there're any work-arounds, and/or if this is something I should be  
concerned about?

Thanks,
Neil.