Ok, this is going to sound odd.

Yesterday the server and client was working.

Today, the server starts, but when the client starts it has this white window which is minimized. And it won't maximize, or nothing. But on the server, it shows me logging in.

Suggestions?

Yes, I tried restarting everything and that didn't fix anything.
 
Well, lets try this first, John: Go into your [Run] then type in "%Appdata%". and then go into your [Local] folder. Go to the Centred folder and delete the XML file. Before doing this make sure the client isn't running in the background with your Task Manager. Also known as "Control + Alt + Delete".
 
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