Account to NAV Customer Card - simple integration

Hello,

I am struggling to setup a very simple integration. All I need is the Accounts from CRM to sync through into NAV. I have activated the Map and can see it syncing every 45 seconds, but each time I see '0 written, 0 failed to write. The log doesn't contain any information at all. There are not any errors on any of the field mappings and I don't have any filters in place. 

I have tested the Adapter Settings for both NAV and CRM and they are fine. In NAV, I have performed the necessary steps to Enable the Connector for my NAV company.

I have followed all of the steps in:

http://msdn.microsoft.com/en-us/library/gg481835(v=nav.70).aspx

Can anybody help?

Thanks,

Matt