I’m experiencing the exact same problem on a clients website 🙁
The plugin worked excellent untill the recent update. I tested it at the time of the update and the test emails came through so didn’t think much more of it.
Now the client wants a newsletter sent and it doesnt do anything. Just sits with: sending 0 of 734 while it should have been sent over an hour ago.
I really dont want to give up on this excellent plugin but the newsletter needs to be sent so I’m getting a bit desperate by now 🙁
Please Stefano, help us out.