Remove Filter does not work

I launched the plugin about a month before WordPress 4.5 was released so that people could test it on the beta and RC versions before 4.5 is released, but I had no reports of issues from people who did test it. I have just checked whether the plugin is still working on my test sites with the released v4.5 — attempting to log in using the email address I get an ‘invalid username’ error when the plugin is active as expected. This indicates that the plugin is working as it should on my test sites.

Could another plugin be hooking into the login on your site? To check whether this is the case, deactivate all other plugins and try logging in with an email address. If you cannot log in with the email address at that point, repeat the test after activating each plugin to identify which one might cause a conflict.

Hi,

Thank you for your very fast response.

We’ve found out that one of our own plugins has the ability to log-in with EMAIL address.

So it was a plugin conflict.
Thank you for pointing this out.

Best regards,
Bart