perhaps it's more of a linux/redhat question then a zimbra question...

I recently setup SSH to deny root logins. So i login as myself, then SU to root to do administrative work.

When i su to root, then su to the zimbra user it gives me the message:
"su: cannot set user id: Resource temporarily unavailable"

I'm able to su to other accounts from root, just not to zimbra.
Google hasn't come up with anything, so i'm thinking perhaps someone here might know something?