I'm using a GridMarket theme, with MarketPress to allow

Hello

I'm using a GridMarket theme, with MarketPress to allow users to register their stores. I've set Multisite User Management, set a New Blog Template to be the frame for the newly created stores and set the roles of the Blog Template to Editor. I'm having the following issues:
1. The Limit blogs per User is generating a Warning and allowing user to see the backend of other user's accounts
2. When a user registers a store, the role he receives is not Editor (as set in Multisite User Management), but Administrator, which allows him to access the backend of my main site.

Please help