For a system error uploading the development version has been posted as the official version. This is the problem. The release has just been re-charged. To resolve this problem just simple delete the plugin from your installation of wordpress, and after that re-install it again. Everything will be magically solved.
I apologize for the inconvenience but not due to an error in my programming. Some time ago the same thing happened to the W3-TOTAL-CACHE plugin ...
Thanks for your feedback marcoslooten ;)