This isn&#x27;t an issue anymore, nowadays there are MMUs which isolate shaders from memory they aren&#x27;t supposed to touch.<p>OP&#x27;s problem stems from the fact that some video buffer used by his browser hasn&#x27;t been cleared after deallocation. At some later time this buffer either has been erroneously displayed instead of the game&#x27;s buffer or has been allocated to the game which erroneously displayed it without filling with new content.