I have 404sef and CB wokign pretty happily together, but the userprofile URL looks like this:

mambo/userprofile.html

I would like it to diplay the username in the URL, liek this:

mambo/<username>.html


anyone know how to do this?

a simple .htaccess trick will let you access peoples profiles that way.

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/]+)/?$ /index.php?option=com_comprofiler&task=userProfile&user='$1' [L]

Put that before any other RewriteCond statements