[Dovecot] Visibility of .subscriptions and .customflags

[justin]

Hi, I upgraded to test65 from 0.99 (mostly to get the namespace feature) and 
now it seems my .subscriptions and .customflags are showing up as mail 
folders in my IMAP client (Eudora). 

If I try and open those folders, of course I get an error. 

How can I configure dovecot so that these aren't displayed to my IMAP 
client?  I looked through about 6 months of acrhives and couldn't find it 
mentioned anywhere. 

Thanks.