try asking your host if they can turn on client side debugging for your website, you will then get the actual error and we may be able to tell you what to do.
I have more problems with my host regarding Snitz. Several MODs do not work. And E-mails to people who registrate do not work. Or, more correctly, nobody except people with e-mailadresses belonging to my "site" (xxx@finsklapphundkulbb.org) do get e-mail when they registrates.