A.L.E.C said the following on 03/07/2013 11:06:
It looks that newest dovecot do not send such folder names in quotes, which is correct from protocol point of view, but Roundcube can't handle it. Open a ticket in our bugtracker and we'll fix it.
Been there done that
http://trac.roundcube.net/ticket/1489223
Ciao, luigi