Re: Wp 3.0.1. Local host: The requested URL /members/ was not found on this server.
Edit// Roger beat me to it 
When you say if I put %category%%postname% sites go not found is this without BP activated?
Helga please check the other thread and just confirm (here) whether you can write to the .htaccess file correctly if you can then the issue lies with your server setup running under http://localhost/wordpress/ or whatever url you have to use.
