The discussion about Stats, and the non persistent setting for "Don't track your own pageviews", has been a topic of discussion for some time now. I publicised the problem of people who filter third party cookies, stating that this is the primary cause of the non persistent Stats setting. Some people, hearing my advice, were able to benefit from it, and responded positively.
But not everybody who understood my advice found it to help them. Many people stated explicitly, that allowing third party cookies did not make their Stats setting for "Don't track your own pageviews" to be persistent. I recently realised that there is yet another level of detail, resulting from one more security strategy, affecting this persistence issue.
Some blog owners, mindful of the dangers of third party cookies, have resorted to compromise. They allow third party cookies, but set cookies to expire when the browser is closed, a setting called "Session Cookies". A reasonable compromise? Maybe so, for security purposes - but not for the Stats controversy.
If you set cookies to expire when the browser is closed, and you select "Don't track my pageviews", you're going to have to expect that setting to go away when the browser is closed. If you can choose between "Permanent" and "Session" cookies by domain, make sure that "Blogger.com" is set as "Permanent". If you don't do that, expect for "Don't track my pageviews" to be reset, each time that you close your browser.