The Gradient color adjustor within the theme has disappeared on my site. Days ago, I could navigate to a section (header>transparent header>design>Transparent Header Background), select the color bubble, and then set the color, image, or gradient. Now I only see the options for Color and Image. I can no longer see the Gradient tab, so I can no longer change the gradient color of the header. The same issue appears across the theme when selecting color bubbles, so I assume that this is a theme wide issue. Do you know how to fix this?