Hello,
I’m sorry for my late response, but I can confirm that upgrading all of the site’s to version 2.0 was the only solution to achieve working notification on all of our site’s. We were just unsecure, when we updated just two, and everything collapsed.
Thank all of you for help. After all the answers, we just made a few snapshot’s and backup’s of our distributed machines and perform successful upgrade on our environment, about 3 months ago.
Thread can be closed.
Sincerely,