After subscription i get an email that looks like this: You've subscribed to category ' ' at link ...
Sometimes it works fine and sometimes it subscribes to category 0 which doesnt exist. Even when i am using the same link to subscribe. I dont understand how it can have such inconsistent behaviour
Try it yourself:
http://www.etsi.org/technologies-clusters/technologies/nfv?tab=3
http://www.etsi.org/news-events/past-events/665-plugtests-2013-itscms3?tab=1
Please help me with this. A list of all the files which get run between clicking on the link and the email being sent would be useful.