I am having an issue with my Multi- Site Blogging

I am having an issue with my Multi- Site Blogging Platform. For some reason users are getting added to other people's sites and then getting error messages that they don't have sufficient rights to access that blog.

I am also having an issue with the Site Copier. For some reason when I copy a post now to all the sites on my network, it's not copying the images and it used to.

Can someone please contact me to help me please?