Hi Tim,

When page names/urls are changed we automatically create a 301 redirect from the old url to the new one, but problems can occur if you then try to change it back because it will not create a circular redirect as that would put the web browser in a redirect loop.

You can fix it by checking the Administration > Advanced Tools > 301 Redirect Manager for any 301 redirect that you don't want, and you can also check the friendly url for the page under Administration > Advanced Tools > Url Manager

See also 301 Redirects

Hope that helps,

Joe