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.
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