Game freezes only for one character
 

I play on Green, and starting yesterday, Xiljian 49 Paladin freezes after a few seconds, causing me to manually close the window.

Other toons play fine.

Any idea what’s happening here?

You probably have a chat box that is too small. If you changed the size of a chat box recently that would be why. Either reset your UI or if you can't get in game long enough you have to delete the character file to reset your UI. That's a last resort because you could lose hotkeys and such if you want to save them. You might be able to open up the file and see if you can change the UI manually in that, but I haven't looked into it.