i clicked my own ad one time by accident, emailed google straight away, but the click showed up, with no change in earnings though, so it looks like google thinks they are invalid clicks
Indeed, probably one of the clicks is 'real' and earned you $0,01. The other four clicks are invalid clicks and therefore these are not shown in your earnings.
yesterday i was paid $0.40-45 per click never had problem with invalid clicks before as i don`t click on my ads $0.01 per click, probably foreign traffic
Ive seen it, especially with such a small amount of impressions (50% at 10 impressions is easier than 50% at 5000 impressions)
Google is smart enough not to show earnings, but not smart enough to not show clicks? sup with that... Happens to me too on some of my smaller sites, and it is indeed strange.