Your optin forms are not active.

Julien,

If you have an account, simply sign in by your email / password.

Same problem, but can’t sign in. The sign in form doesn’t work. (no error messages, just reloads the sign in box)

mjalder2, can you email us your site and account information at support [at] mailmunch.co

same issue here…

jsloan, can you email us at the address above?

Same issue. I sent an email to support with my newsletter email account

WordPress version is 4.4.2 and I have the latest version of your plugin

Thx

Solved.

I deactivated MailChimp Forms by MailMunch and I can login in Mailmunch plugin page.