If you are seeing this on the site then most likely you are using some sort of ad blocker. To get the site to show up normally, turn off the ad blocker. I'm not sure if this is a bug yet or intentional on ZAM's part.
This is a change on part of a new advertising company ZAM has set up. Currently the white background and no navigation controls is a bug and they are working on it.
Right now this only affects users on Chrome using ad blocker. This shouldn't affect other browsers using an ad blocker. However this new advertising system is made to get around ad blockers and in the future most likely this will be done for the other browsers. So if you don't like seeing ads I would suggest paying for the one dollar a month subscription.