First thank you very much for this awesome plugin.
Today after update form 1.6.4 to Ad inserter 1.6.5 version.
Find out the following bug on my wordpress 4.4.4 version.
http://i411.photobucket.com/albums/pp193/imuimui/AdInserter_zpsyhz3lyg4.png
Sorry for wrong report, this problem because the cache problem, after refresh everything is fine.