This was on a fresh install. The only plugins I had was akismet and buddypress. I upgraded the server from php5.2 to php5.3 last night. When I checked it this morning I was no longer getting these errors. I don’t know if this is the reason why it started working right, but could be.
I am looking for the exact same thing for my multi-author website. It looks like you would have to make use of the Google Analytics API to do this.
If you come up with anything let me know. Maybe we could even pool some resources to get this done as I would really like for my authors to be able to track their own posts.
I am in need of something similar that would allow multiple authors to input their advertiser id, on their profile, from several different advertisers. Then inject multiple ads on posts and then rotate impressions between admin and author. I would be perfectly happy to donate to the cause if you can help me out.