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Given the CTR changed in such a huge manner, I think it's a technical glitch (that hopefully Google will correct soon).
AdSense stats for yesterday are updating
[edited by: alika at 6:16 pm (utc) on Oct 7, 2010]
[edited by: netmeg at 6:18 pm (utc) on Oct 7, 2010]
[edited by: kd454 at 6:32 pm (utc) on Oct 7, 2010]
[edited by: maximillianos at 6:41 pm (utc) on Oct 7, 2010]
Now that's weird - I've NEVER seen a change to the previous day's figures before. No change to the number of impressions but the # of clicks and the revenue amount both jumped significantly.
Mine is still adding a click here and there for yesterday, and today's figures just doubled, so now things are back on track, and looking very nice indeed.