may be related to http://trac.roundcube.net/ticket/1485975 ?
Thats very old but there has been an updated marked as "fixed" just one day ago: http://trac.roundcube.net/changeset/4547
I will wait for for the 0.5.2 release to update then.
Kind regards Marten _______________________________________________ List info: http://lists.roundcube.net/dev/ BT/aba52c80