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Yes - some advertisers are seeing a delay in their stats today. The engineering teams are aware of this and, as you might imagine, are working to resolve it as a priority.
Please know that ads have continued to run as normal. This issue revolves around the reporting of statistics only, and does not impact ad delivery.
I'll post again when I have anything of substance to add - and, in the meantime, my apology for the inconvenience this is causing you.
From AdWords Advisor in the AdWords forum