Download ID is set in all. I manually updated to 3.1.3 using my active account ID for WorkingZombie. And my subscription still says expired in some of my sites but not all. I thought I read a thread where 3.1.3 would fix that bug.
Yes, there was a bug in the extension. Yesterday (more or less at 7pm) I uploaded a new modified version of 3.1.13, so if you updated your site before that time you will have to re-install the extension.