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As you know, you will not be able to access your account during this maintenance, but your ad serving and reporting will not be affected.
Don't laugh. Maybe they are taking filter slots away. Makes perfect sense, you know. More publishers = more filters = increased server load. Actually, the ONLY way to overcome this problem might be trimming the competitive filter. As Google has very few spammers anyway, we probably won't need that much space.
(It's too hot where I am - too hot to be serious.)
Antoher opportunity for Google to take 100% of my adsense profits for several hours.
It would seem that way, either that or Google is losing valid data.
For me Saturday's earnings were 28.57% down on the year's Saturday average and considering the worst Saturday before that was "only" 13.91% down it certainly would seem that their constant tweaking is having an adverse effect for some publishers.
AdSense issues, horrendous search issues...are AdWords users having issues?