There is no error message if username and/or password is entered incorrectly.
In general settings the site is usually set to not block wp-login pages (no), but to modify it (yes). If wrong password or username is entered when we are using these settings, nothing comes up (no error messages). However, if PR is set to block wp-login (yes), the url becomes as follows:
http://beta.aarhonen.no/login/?login=failed&wp-error=%3Cstrong%3EFEIL%3C%2Fstrong%3E%3A+Passordet+du+skrev+inn+for+brukernavnet+%3Cstrong%3Eadmin%3C%2Fstrong%3E+er+feil.+%3Ca+href%3D%22http%3A%2F%2Fbeta.aarhonen.no%2Fmin_profil%2Fpie-register-forgot-password%2F%2F%22%3EMistet+ditt+passord%3C%2Fa%3E%3F&pr-user-login=admin
We use selfmade norwegian localization as you can see “Ugyldig brukernavn” = Invalid username, “Mistet ditt passord” = Lost your password, etc.
The url changes as stated, but there are still no error messages on page.
We are using WordPress version 4.1 and PR version 2.0.14