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CTR has been outrageously low today.
Must only be broken in certain places,
That's entirely possible since we're not all on the same servers therefore a minor glitch for Google with one server could be a major upset for the publishing accounts on that server meanwhile no one else experiences anything and they wonder why we are posting here.
That's my guesstimate:-)
That "glitch" has lasted a long time then.
Personally, I don't think it is a glitch.