Hi not sure if this is something that CB does or could handle or whether it should be a Joomla core feature request, but...

It would be really good if you could customize the page which says:

You are not authorized to view this resource.
You need to login.

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It would be great to customize so that you could promote your community and urge people to sign up instead of the cold message it currently is.

Cosmic...

http://cosmicfantasia.com

I would start searching the Joomla language file ...

thanks....