Draw Button - Hitbox name not working

I have a very basic menu setup using a HUD blueprint to enable the player to choose between different characters.
I’m using the Draw Button node to both display text and create a Hitbox to click on.

This used to work (project was created in 4.8.3), but since updating to 4.12 the Hitbox only ever returns a name of ‘None’ regardless of what is entered into the text field.

This is how I have the Draw Button node setup:

96041-sshot-1.png

Am I doing something wrong?

Thanks