[Plugin: MailPress] Can’t subscribe or add mailing lists

for some reason I can’t subscribe to mailpress using the widget – just keep getting the “loading” icon when I try with jQuery preloaded and a 404 page when using the javascript (only) preload option.

I also can’t seem to add any mailing lists or edit the name of the “uncategorized” one that’s in there by default

Very frustrating – otherwise this looks like a plugin I wouldn’t mind paying for

btw – this problem was in v3 so I cleaned out and installed 4.0 from scratch and still have the problem. I’ve tried deactivting all plugins and custom themes and only having the mailpress plugin/s activated and it still doesn’t work