I’ve found out why, there is a bunch of notices when PHP error reporting is set to show all errors. This is because of poor programming practice of wp postratings author to acces GET variables without checking are they even set using isset(). Kind of sloppy.
This plugin is coded quite sometime back and I usually don’t code with notices on (I know it is bad practice and sloppy!). But this is not really critical when you compare this to additional features or bug fixes.
I am not sure that I actually understand the above explanation. Could anyone explain what to do in a more simpel way? I am not that experienced in WP. I have just downloaded WP estore and I keep on getting the “Notice: Undefined index:…” messages in the admin part of the plugin.