Hi Bojan,
I am having a similar issue. Can you explain in a little more detail
Can you please try removing the IPN URL from your paypal settings
As the instructions when setting the plugin up specifically say:
In order for Membership 2 to function correctly you must setup an IPN listening URL with PayPal. Make sure to complete this step, otherwise we are not notified when a member cancels their subscription.
Thank you in advance,
Will