SA1100 won't add new domains

[CA1026494]

I have a SA1100, and when I try to add a new domain, it says that there isn't enough free space (which is wrong, since there's 86+GB free). I see that the original website has a "0" disk quota, and I wonder if that is interfering. Also, trying to change that "0" SAYS that is successful, but refreshing the information shows that the "0" is still there. I am frustrated, because I want to add some new domains on here, and I can't get anything to act as it should. Someone please help me!

-- Desperate Dave