[Dovecot] 2.1.5 problem with mail_location

[postmaster]

I've been advised to set :
mail_location = maildir:~/
as the home directory is found through a sql request.

this has been working perfectly up to and including 2.1.4

from 2.1.5 however this setting gives cause to a problem :
instead of looking in the mail home eg /var/mail/domain/user\@domain/ 
dovecot is looking for mail in /var/mail/domain/user\@domain/~

the '~' directory is created upon the first request for mail and all 
future mail transactions in dovecot is done relative to this folder.

is this behavior a bug or a feature ???

-- 
Bjarne D Mathiesen
København N ; Danmark ; Europa
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denne besked er skrevet i et totalt M$-frit miljø
MacOS X 10.7.3 Lion ; 2.8GHz Intel Core i7 ; 16GB 1067MHz DDR3