Adverts do not save. When I click on save, it strips all of the coding away.
This has been known within the Mingle Forum support forum for a long long time and many people have commented on it, but no replies have been made by the developer in at least 64 days http://cartpauj.icomnow.com/forum/mingle-forum-plugin-group1/support-forum6/google-adsense-ad-not-showing-thread1709.1/
Many support requests on wordpress are open about this and other issues.
While I know that no support is guaranteed for these free plugins, I do expect that their own support forum receives replies as a new release has just been made that addresses none of the issues reported.