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This is because your norton software blocks HTTP_HEADER information, which is needed to check if you are logged in or not, and on many other places as well. Your users will have to add your XOOPS site to their trusted sites, or set the HTTP_Header blocking off.
Also see the wiki for information about firewalls
About the about page, we're about to release the wf-channels module, tha does exactly what you want (and more)! Just a little patience
Herko