Login screen not opening up after launching the client

So, after launching the game (pressing the launch button in the first screen), the login screen does not show up for some reason, i have already looked through the various discussions about this, but none of the solutions mentioned worked for me. I read through the patcher logs, but i couldn't figure out, what is causing this to happen. The patcher worked just fine yesterday and i dint change anything regarding my client, as well as my whole computer(no Installations, uninstallations, etc.). I appreciate any help. ;D