I had this same issue and it was because I changed the text color to white (it is blue in the screenshot below) because I wanted the title to be white with a blue background. When I did this it changed the pop-up text to white and I could not see the words unless I highlighted them. I changed it back to blue and in the title I changed only the title words to white. The text color on the General tab changed the pop-up color and the title color, but the background color only changed on the title background and not the pop-up. Now everything works and looks like I wanted!
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