Active plugin and my site goes down

Hi,

I just tested Simple Ads Manager and it seemed to be working well so I thought I would try the latest sam-pro-free.

I installed and successfully activated the plugin in the backend but on the frontend I cannot access anything, My pages go blank white, they load the <title> but no content is displayed.
The wordpress admin backend can still be activated.

Has anybody else had any similar problems?

Upon deactivating the plugin, the frontend pages starts resolving again.

Do you have any idea what the problem is?

Matt

https://wordpress.org/plugins/sam-pro-free/