Today for the first time in the 7 months that I've been using Adsense, I noticed a click that did not have any associated earnings.
I used the registered version of asRep to verify the following:
1) It was indeed a paying ad (as opposed to a PSA). It was an ad that I was previously paid for. (Besides I don't have any PSAs on my site whatsoever).
2) The IP address of the individual who generated the click was not mine (ruling out an accidental click).
So it would seem that Google has deemed this click to be an invalid click. I'm kind of wondering what I should do about this (if anything). I'm also wondering if there is something I've overlooked that would have produced this discrepancy.
Any comment would be appreciated.