User not added multisite

Hi,

I am starting a multisite with subdirectories. But I can’t add users to a specific site.

If I use the “add new user” option on a site in a subdirectory an activation mail is sent to the new user, but when clicking on the link it says that the activation code is invalid. If I check the option that a user will be added without a activation mail (I’m using the Dutch version, don’t know the exact translation), I get a message that the user is added. But when I take a look at the users, the user is not there. Neither in the Mysql-database.

If I use a registration plugin, the user is added to that site. But the strange thing is that the user has access to all sites, instead of just one. While looking at the users via the network dashboard, it only shows acces to the specific site. (for security I don’t want to use the registration form of the plugin).

I’ve tried with and without the plugins activated.

It makes me nuts, hope you can help me out.