cyradm: dm permission denied AFTER setacl

[brian]

I cannot delete a mailbox with cyradm. Specifically, setacl seems not to 
be working:

localhost.localdomain> sam user.admin at DOMAIN.org cyrus -c
localhost.localdomain> dm user.admin at DOMAIN.org
deletemailbox: Permission denied
localhost.localdomain> lam user.admin at DOMAIN.org
admin at DOMAIN.org lrswipkxtecda


So, it seems the that sam is not working suddenly. I've never 
encountered this and cannot find anything online that suggests how to 
deal with this. Does anyone have some idea of where to look?

b