Gah, I’m hitting problems too. I’ll try to uninstall and reinstall, see how that goes, but I’ve got similar issues as described above - doesn’t recognise my subscription past a certain date so tries to get me to pay, and will not download any of the issues that it recognises I’m entitled to.
Fired off an email, but quite antsy as I’m a couple of months behind in my reading.

EDIT: reinstall fixed it. Hurrah!