Firstly, there's the old problem of ads not appearing. I have a campaign with 3 UK ads. Two of them appear fine, the 3rd never appears at all. The bid is pretty high, the target is UK only, the daily budget > recommended, the ad has not been banned, nor is it underperforming (difficult), it is live, it has not been deleted, I'm Google-ing from the UK, I'm searching on the right keywords and I have simply no idea why it does not appear. Stats are not being updated for this campaign so I have nothing to go on.
Secondly, and more worryingly, I deleted an ad yesterday (in another campaign). It says "deleted" and stopped appearing. But now the impressions and clicks for that deleted ad have started to increase again!?
Can anyone advise?