Problem with marketpress global store


I have installed a WP Network, where i installed the marketpress plugin for making a global shop.
I have setup things, and i can see products from my test shop on the global site, but when i want to buy it or see more informations about problem it sent me to a page telling me there is no product.

Also in store settings, when i try to change the mode from sandbox to live it does´t change. I never seen this problem before.

I have only WPMU Dev plugins installed, except from Contact Form 7, OnTheGoSystems plugin and CleanTalk.

Hope some can help.

Best regards,