New answers tagged drawing
Take a look at Creaturehouse Expression and its conceptual successors Krita, Illustrator's Live Paint Tool (and brushes), Freehand's Brush paths and similar techniques which will allow you to assign a transparent fill to a vector / path.
I have created silhouettes by drawing or photo of what I would like as a base. I then take it into illustrator and trace it with the pen tool and fill it. You can also image trace and edit anchors to your liking. You could always purchase vectors but they may be hard to manipulate nor exculsive to your client.
If you have PowerPoint 2013, you can use the fragment tool to quickly create the individual pieces that you can then freely format as you see fit. See below tutorial. PowerPoint 2013 Venn Diagram Tutorial - The Middle Piece
My first guess is simply that you have a layer that is locked. Go to the layers panel, and see if there is a little padlock there. I doubt it has something to do with the C-shapes you have. Or, as @Jenna points out, something is "behind" something else, and you need to bring it forward.
Top 50 recent answers are included