PC I can't write on signs

[BloodThirstyAvengers]

As the title suggests, I can't write on signs. I enter the interface, click edit, start pressing keys and nothing happens. No mods, single player, tried toggling autopause, didn't work.

 

[DV Game]

can you send vid of it?

 

[BloodThirstyAvengers]

Just played again. Still can't sign.