As I wrote in another topic (http://wordpress.org/support/topic/plugin-adsense-manager-broken-on-wp-332?replies=3) there are several errors in this plugin.
After reviewing some of the code, trying to fix the bugs that appears just after the activation of the plugin, I realized that the plugin needs a code review.
Most of the error I got were PHP Notice which might indicate that the development of the plugin was done without the PHP Notice error displayed.
There are also a few error because of deprecated functions / parameters, but the main point is that this plugin in no way is suitable for a developer when developing because it flags a gigantic amount of error all over the admin pages and also at front end!
It seams like there's a lot of great code in this project and its a shame if its not maintained, because as it is now it is only half done!