Hi, Carlo. I’ve had major problems as well. When I tried to use the Campaign Monitor Synchronisation plugin to add subscribers from my wordpress site to a Campaign monitor list, it kept giving me error screens, but now the list that I was trying to add to has had all the subscriber custom fields deleted. Even now, it goes from 4 custom fields, to 30, to 1 (different each time I login to CM) and random subscribers end up in the deleted section in Campaign Monitor, even though I have done nothing. Campaign Monitor have tracked the use of the API code to my wordpress website. What is going wrong? I have deactivated the plugin and the random changes have stopped, but I have already lost all the custom field details for my subscribers that where already on Campaign Monitor.