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Check in the root directory for a file called .htaccess A typical way of listing the 404 redirects in the file is like this: ErrorDocument 404 /404-error-page.php If you don't see a line that starts with "ErrorDocument" then Joomla or Virtuemart are causing the problem.  If it is an old version of Joomla, it needs to be updated anyway for security reasons.  If the line seems messed up in the .htaccess file, you can at least send it to a working page like this: ErrorDocument 404 /index.php Maybe that will at least send it to the front page.

I'm not certain, but is Orderwise along the lines of what you're looking for?

Hi John, I wonder if you will find your issue described in Mike Blumenthal's latest post: http://blumenthals.com/blog/2012/06/25/a-step-by-step-to-recover-your-we-currently-do-not-support-this-location-in-mapmaker/ There has been considerable fallout from the changeover to Google+ Local. Perhaps you will see your situation described in the above. Miriam

With Joomla all the url's use $mosConfig_live_site in configuration.php at the start of the URL's and then everything is routed through index.php with query strings. If you're doing a 301 redirect you might want to have a go at using the following in your .htaccess file, without knowing what your redirecting to what is difficult  to provide a correct answer. RewriteCond %{HTTP_HOST} ^domain.com RewriteCond %{QUERY_STRING} ^option=com_content&task=view&id=76&Itemid=110$ RewriteRule ^index.php$ /your-new-page/? [R=301,NC,L] ID is the content ID and Itemid is the id of the link in your menu to that page. Hope this helps.

We did have some cases of crawls not happening.Send an email to help@seomoz.org with your information and we'll get things working for you. So sorry about the problems.