Same here. Specifically, I have a character highlighted. When I click on "Delete" the Delete dialogue shows up, and the character nickname is filled in ("James") but the OK button is grayed out. I cannot edit/delete the text in the box ("James").
The bug still exists in my game. Basically for me, it is asking for me to type in the character's name in the dialogue box...but it actually auto-fills the name into the box, and won't let me select OK.
It also wouldn't let me edit the text in the dialogue box....or so I thought. While the cursor was in the box, I clicked the tilde key (the `~ key next to "1" on the top row of your keyboard)...I typed in the character name after the tilde I made...and then scrolled it back, and deleted the tilde (But left the name intact). The OK button instantly lit up.
I hit OK, and nothing immediately happened. I logged out, and logged back in and the character was gone.
So I had to walk in a big circle to get it done, but it ended up working. Still seems a bug, and I did submit a bug note in the game.