Hi,
I bought this plugin for a client and it's working fine ... now after I found the correct setting.
I'm not sure it is a bug or if it is the intended behaviour but at least the tooltip is mileading. The access level tooltip for the plugin says:
"Select the view access level for this plugin. Only users with this view access level will be able to access this plugin and any tabs or fields associated with it."
For me, this controls the access to the settings and, more importantly to the the logs, but in reality you have to set it "lower" (to the registered level) because otherwise it will log only the changes of the Admins, which is obviously not the purpose of this plugin.
So it is working but this access level thing does not make it intuitive.