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This is explained in the Adwords FAQ here ...
Maybe this is the problem ...
What happened here is that your impressions/campaign reached a certain number of impressions since last being reviewed by an editor.
I think its 100,000 impressions, before the ads are put on hold, and than an editor looks at them again and re-approves them most of the time.
This is very different from the daily campaign spend limit.
Hope AWA can give the exact definition on the above...
[edited by: Shak at 9:20 am (utc) on Dec. 24, 2003]