Nobody got a solution to those problems?
I got a related problem: I have been using Stats for several externally hosted WordPress blogs, all with one API key (without problems).
Now I have deleted those blogs and merged them into one, on one web adress, but I cannot delete the accounts or profiles (or whatever it’s called) of the no longer existings blogs in the WordPress.com Dashboard. I have no problems using Stats with my existing blog, but it’s annoying to see profiles listed for blogs that no longer exist!