All look completely normal and my ad inventory is great, I don't think I have ever had cause to complain about my ads, and as I said in the original post, my EPC is fine.
Someone mentioned awhile back that they had one extraordinarily high day and one extraordinarily low day a month...fingers crossed that yesterday was it since extrapolating today's metrics and I should be back to normal.
We'll see, and I'm holding on with both hands just in case:-)...the seaweed of course.
Now there could be an explanation! I live on the east coast of the UK and it's been snowing again, well, yes/no?