First we should try to fix this error:
cannot use a full URL in a 401 ErrorDocument directive --- ignoring!
Take a look at your virtual host configuration in cpanel, and check if there are ErrorDocument directives.
Another error that can be related to is:
Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace.
I've checked redirection items in ReDJ and I haven't found loop condition, so, take a look to your cpanel redirections.
Let me know,
Luigi