Invalid Login issue

Try to reformulate your question, it's not very clear.

I'm sorry, but which part of Invalid Login isn't clear enough?
At the Login Page, no matter which user I use to try and login, it just keeps on saying "INVALID LOGIN".
There is nothing wrong with username and password, since it always worked without any invalidation.
Could this be a bug in the application developer of PHPRunner?
I'm using PHPRunner 5.3 Build 7474.

Make sure the username and password fields are linked in the right way in the Security tab of PHPrunner (http://xlinesoft.com/phprunner/docs/login_page.htm)

I'm sorry but, if the username and password weren't linked in the right way, at the very beginning, I would have never managed to have successful login's as I was used to.
Like I first wrote, and please try to understand correctly, while working on my application, the Login Page has stopped accepting login's and keeps on telling me they are all Invalid.
Yes, I have rechecked all the steps. In fact, nothing was changed, it just simply started not to accept any login's.
Now, how is that possible? Must be a bug...

It seems something is going wrong with the credentials table. Users could have changed their password, try to add a new user to the database and do a new login attempt. Check also if something is blocking the authentication in the "Before login" event. This is the only way I can help you.

OK.
I have found the issue.
In the "Before login", in the Events section, the "return true;" was missing and this was causing the application to return all login's as Invalid.
Thanks anyway!