Breakpoint red circle glyph is missing

Question

I have set a breakpoint on a line of code in my Visual Studio 2013 IDE, and in doing so I see that the red circle that usually appears on the left is missing. The line is still highlighted with the red background - that's working fine, but the red circle image is not shown.

Does anyone know if this is a setting in VS, or does it sound like something is broken?

EDIT:

Here is how a breakpoint looks in the IDE (non-running):

As you can see, the red circle that usually appears on the left is nowhere to be seen.

Answer 1

My issue was caused by a setting.

I had "Indicator Margin" disabled in the Text Editor -> General settings. Ticking that box fixed the problem.