We using this plugin 3.9 for quite a while and it had some problem with synchronization. After riding post on the forum I find out we have older version and I download the newest one from April 24.
Now the problems get even bigger!
We have little over 9000 subscribers in our newsletter and afer this update it show we sill have same amount of people on list but only 300 is subscribe and rest is unsubscribed.
So now our email marketing is very limited.

Can somebody please help us.