How are you drawing the background? Drawing it yourself with a quad covering the viewport or just with your call to glClear? I suspect what you're seeing is due to the default background colour. By default it is:
glClearColor(0.0, 0.0, 0.0, 0.0)
i.e. fully transparent black, not opaque black (bottom of page 186 of the OpenGL 1.5 spec).
You might also want to check which blending equations / functions you're using.
r i c k
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