I will start with big complements: Great plugin! many thanks!
My problem is as follows: I was developing a website on one server and moved it to another. After that, I could not see my subscribers. I tried importing them again and it did not help. I can see them on the maintenance page – it does say that there are 2000 confirmed subscribers, but on the list I see only one: my own!
I uninstalled and reinstalled, and imported them again, nothing changed!
I also updated to the latest version of Newsletter, just the same problem.