Mailpoet not creating daily newsletters

We have a daily newsletter that goes out – kind of a daily brief from our local news website.
Since Aug 30, it hasn’t sent.
If you look at Newsletters, you see it ready to send each night around 6pm, but then it never does and doesn’t show up after that as a “Sent to X out of X”. So its not like its a sending error, but rather its just not sending anything at all, then just disappears.

IS this a problem anyone else has seen??

I’d understand if it was a sending issue and we got an error or something, but its just not even doing anything for the past two weeks.

Any help/thoughts??
We’re using Sparkpost as our sending platform, and they show no errors.

Thanks!