On my home page I have one color section using a background png image with transparency and another with a parallax image in it with a quote over the top. Unfortunately, the use of a second color section has made the second (para) effect to stop working and therefore displays only the text and no image.
I saw this some months back and thought it was such a big issue that it was bound to be fixed by the time the last update was released.
There were some changs and improvements in one of the recent updates in how the color sections worked together. We would need to see an example of the issue and then try to re-create it to get an idea of what might be happening.