Cookie disabled warning

I created an example app using vaadin-archetype-application-example. It creates a root and 4 maven modules. The ui module app runs fine on tomcat 8.0.27. The production module built with -Pproduction starts up fine without any error. But it always presents the "cookie disabled" when I click on login. Since the same firefox was used to access the ui module version without an issue, there might be some issue with the module production built?

Since 7.6.3, the issue is resolved.