It appears that the issues you are having are not related to Joomla! 3.4.x, we have tested plugin and everything works as expected.
And to clarify: "This does not happen. He gets redirected to the homepage with error "You are not authorised to view this resource.".
After some research I found this to be a problem of the Guest Access setting of the menu for the login page. After login this page disappears from the menu." doesn't appear to be caused by our plugin.
That said, I would think your issue has to do with Hikashop. If we can manage the time, I will see if I can test further with Hikashop.
I will post updates to this thread.
I'd love to change the world... but they won't give me the source code!