After multisite installation (blogs are on subdomains) all blogs I create are blank index?

After multisite installation (blogs are on subdomains) all blogs I create are blank index ...

1. My goal is to offer members to have possibility for easy creating of blogs - websites ... each higher membership level will offer possibility to create more blogs with more disk space to use.

Each new blog is placed on subdomain ...

But when I try to create new blog on new subdomain, it is created as blank index page.

How to solve this?

2. I want to use Paypal as payment option. But I use Paypal already on other websites. Regarding IPN settings I have read that I do not need to set them if I already have set them for other websites. All other websites are located on 1 other server - so same IP. But this websites is on different server.

Is it still true that I have to do not have to set IPN settings?

Best regards,

Mateo