I've been playing PRO for 3 days now, and everything went fine. I even played this morning, which is about 2 or 3 hours ago. I wanted to login again, but I can't.
I started up the client and I already noticed that my login name and password were gone. I have the 'Remember password' box checked and all I had to do was click login to start playing. I typed in my login name and pass, clicked login and nothing is happening. It does make the 'click' sound when I try to login but that's it.
Edit: I can login on my phone just fine