When I select a background color for the whole page in the general settings, Custom Community Pro applies that same background color to the Footer Widget Title Background style. Usually, the Footer Widget Title Background style inherits the color set in the Sidebar Widget Title Background Colour setting. Regardless, you don't want a title background color being the same as the page background color.
In the sidebar, the widget title background colors appear as set as long as I don't hyperlink them. If I hyperlink the widget title background color, the text gets a background color the same as the page background color. If I go to general settings and set the page background color to nothing, all these problems disappear. It is definitely related to setting the page background color.
I'm hoping a developer sees this and responds. Sending a support ticket through through the Pro website never seems to get any response.