Dear Robert,
you also can download the background image (bricks) directly from the BrickYard Premium demo site: http://brickyard.tomastoman.cz/wp-content/uploads/2014/06/background.jpg (2000 x 1300 px). To set the background image to cover the whole screen, please use the following Custom CSS:
body {background-size: cover;}
BrickYard theme is compatible with the JetPack plugin, so if your problems continue, please try to contact your web host provider. You also can try the Contact Form 7 plugin, which also works well with BrickYard theme.
Best regards
Tomas Toman