I have upgraded to JNews Pro 753.
I sent the newsletters by using the sent-button in the row of the newsletter (colom 7) and then there appears a window which tells me that the first batch of 60 subscribers is sent.
This repeats after 310 seconds till my 619 newsletters will be send.
In earlier versions of JNews there was not a small window but a temporaly webpage where you could see the countdown.
After sending the last batch the program returned to the JNews-extension and gave a messagetext (e.g. sending complete).
In this new version the last or sometimes the nearly-last window stays open and I have to use the X-button to close it and then I see that the newsletter is really send.
I hope I could make you clear what I mean.