Videos not loading for with multidomain second domain

Hi, i have setup a second domain with the multi-domain plugin, and am resolving a second domain mysd.com.au this works fine in every sense of the word, except for the video tutorials which show access denied (site not registered). The root domain mysoutherndowns.com.au works fine with the tutorials. Is there any way i can adapt this extra domain to make it work, as the plugin suggests compatibility therin.

To add to the background - running multisite with multi-domains plugin - mysd.com.au is part of the parent site mysoutherndowns.com.au.

Thanks