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It looks like the new corner Ad that should pop up is breaking the site - removing everything else from the screen. Is anybody else having that issue?
Breaking the site? More like "enhancing your shopping experience and providing added value", I think. Hehehe.
It has been confirmed that this ad can be turned off.

https://www.gog.com/forum/general/ads_when_redeeming_gaming_amazon_code/post21
As kindly as I can manage to say it: What ad?