Getting Strange Login Box when download Manager is activated

I have been using DM for a number of years now without issue. Recently google notified me that it will be treating my site as insecure because I am not running HTTPS and I am presenting a form thats asking for a password. When I investigate this it seems that wherever I am including a shortcut code to a DM file its presenting a login box wrapped around my content. I have proved that by removing the shortcut links, disabling Download Manager or removing Download Manager everything works as expected. Only pages that include download manager links to files are affected. Just before I give up with DM I thought I would ask the question here. Anyone help with this?

You can see the problem on this page where I have two file links embedded like this… and you will note that for every link included I get an extra login dialog nested…. its stupid.

[wpdm_package id=’1750′]
[wpdm_package id=’1748′]

http://gerrysweeney.com/racal-dana-199x-diy-high-stability-diy-timebase-hack-for-under-25/

Another piece of information that might help. When I am logged in to wp-admin, I do not see this problem on the affected pages, this is only happening when an anonymous visitor is viewing the page

Anyone? I think I am going to have to give up with Download Manager….