I'm not sure if the problem was in the *reporting* of the click-thrus (for paid urls thru PT) or the actual click-thrus. When I queried the sudden plunge in click-thrus with PT early this month I was told there was a glitch, in the way Inktomi was reporting url data, that was being fixed.
Whatever, as of Apr 17 the reported click-thrus have hiked back up to what they used to be - from 4 click-thrus to 40 click-thrus overnight. :)