blogs created by Batch Create aren't accessible

We have run Batch Create and the blogs and users appear in the system and can be edited. However, when clicking on 'backend' or 'visit' it throws an error page (Internet Explorer cannot display the webpage).

We also have the issue raised elsewhere of the blogs appearing as 'private' not 'public' but changing this via 'edit' doesn't resolve the issue

Can anyone help?

Thanks