Okay, so please post output from this command :-
Code:
ls -lR /opt/zimbra/mailboxd/webapps/zimbra/skins/aicto
if they are all owned by root now you will need to do :-
Code:
chown -R zimbra:zimbra /opt/zimbra/mailboxd/webapps/zimbra/skins/aicto
and the try the skin again as the zimbra user.