I also suspected impressions weren't updating as quickly as the clicks were. Seems to be closer to normal now. I just thought it was a roll over from the same problem Saturday (scroll down in the post) [webmasterworld.com], where impressions were not updating, but clicks were.
I am new to AdSense and the CTR has dropped significantly lately, I guess the reason is it was more interesting in the beginning since many of my visitors come back frequently. (I have only run this for 2 weeks.)
Did you guys have the same experience?
Althought it is still good revenue and I am not going to complain ;-)
It is probably a combination of Blaster, weekends being slower, summer holidays, etc, as to why it has seemed slower the last few days. Since you have only been running for two weeks, don't worry ;) Fluctuations are normal, and after a month or two, you will begin to notice particular days of the week do better for you.