When I put a binding on a button, the text disappears

When I put a binding on a button, the text that I have on there becomes invisible and I am not sure why. I am currently using 4.7, but I had the same problem in 4.6. The button itself works, but I can’t see the text on the button and I am doing a dialogue system so it is rather important.

I have same issue here. My version is 4.8.2.
Mine is a text alone, when binding to a blueprint varaible(convert in a blueprint function).
It works when editing, but the text will disappear after re-open the level.

:“text will disappear after re-open the level”

is it there the first time you play the level?

Yes, it exist well after editing and play.

It will disappear on the next time the level is opened.