netmeg - 7:43 pm on Mar 29, 2012 (gmt 0)
A day isn't enough to go on.
I went into my stats and ran the numbers back to September (which is as far as they let me go back) and anything that didn't have more than a few cents of earnings was blocked.
If you've never allowed 3rd party ads before (i.e. had them all blocked) than I'd give it at least a week or two.