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Hey Vicki- Are you playing on an Android device? A few people have posted in King Care with the same problem. It appears to only be affecting some Android devices. A moderator has commented in this thread, so I believe that King are looking into it. Hopefully the problem will soon be fixed :-) In the meantime you can play on Facebook, as everything is working well there.
https://care.king.com/en/candy-crush-saga/screen-flickering-badly-since-last-update#entry_20808