Can't log in to server

[Plombo]

This started sometime yesterday or the day before. Whenever I choose a server, the login screen comes up as normal, but when I enter my username and password and click "Log in", nothing happens. Is there a solution to this problem?

 

[dgkGORGEOUS]

I have the same issue, and it's been this way for several months. No idea what happens, its like the login button is broken...

 

[ArcticxWolf]

Same. Help someone?