I've just upgraded (more like forced an uninstall of 2014 and then installed 2015).
When running the Vulnerability Scan, it says at the bottom of its panel, "Vulnerability scan was unable to connect to the Bitdefender server, please retry later. If the problem persists, please contact our Customer Support".
I don't think this is the "official" channel for contacting support but I'll happily take constructive suggestions on this one.