WordPress Magento plugin

I have a problem with Magento plugin on WordPress.
The plugin is installed and configured. Magento SOAP API is set for a user with Role.
Now, in my post, nothing happens. It shows empty DIV, while i have products and categories to show. Any ideas?

Note: I made a code debug for the plugin's connection, seems that everything is ok. But i get empty response. The content is empty all the time.

via Chebli Mohamed