mwoffenden,
Those post are a bit date but the membership provider(s) that I had created where for DNN 4.x. Which version are you using now? I've not had a chance to look at the DNN 5.x provider changes (as I know there have been). If you would like to email me seperately @ hkenuam@engagesoftware.com, I will see if I can provide some help/direction.
Regards,
Henry Kenuam