I have the same problem with hosting controller. I have to rename my web.config file out of the way to be able to log into hosting controller. Of course this breaks my
website hosting while I'm in there.
Personally Hosting Controller seems a bit shoddy to me. I have several databases, subdomains, domains listed that don't exist. I try and remove them and it just fails. Presumably the database that runs Hosting Controller is out of alignment with what is truely installed.