Had a problem the other day where I could not login to Unisphere on a VNX after doing the configuration with VIA.  I could login to root locally (sometimes) but not sysadmin.  After doing a little hunting and seeing that I could get into SSH on the CS0 with root.  I ran the following command

/nas/sbin/navicli -h spa security -adduser -user temp -password temp -scope 0 -role administrator

This created a username and password of temp for unisphere and allowed me to login.  No clue what made unisphere not like the password when I set it up with VIA but the other 2 accounts had no problems.