Your site is displaying a "bad_httpd_conf" error for me.
This indicates some kind of error in the Apache configuration file. These errors can sometimes be rectified by the following procedure;
Go to Domains -> Manage Domains in the panel.
Click on Edit for the relavant domain (in the Web Hosting column).
Click Change fully hosted settings now! without actually changing anything.
This causes the Apache configuration file to be rebuilt.
If this does not solve the problem, then a support request would be the next logical step.
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