I hit this problem too.
In my case the problem was that the email addresses I was using to test with had generic prefixes like ‘info@’ and ‘hello@’. When I tried with a personal email address it worked just fine.
Worth checking before you go through deactivating all your plugins etc.
1.8.9 update fixed it – thanks!
Same here. WP 4.5.2 + AIO 1.8.8
Great plug in, though. Just a bug that needs fixing.
