OpenGL - One of eight simple box drawings disappears ...

Hello all,

I'm drawing some stuff using OpenGL32, and have run into something I can't 
explain.

I'm drawing a line and two rectangles with "markers" (a small box) on each 
corner.  For some reason *one* of those markers disappears.

The code:
- - - - - - - - - - -

glPushAttrib GL_CURRENT_BIT or GL_ENABLE_BIT
glColor3ubv

glBegin,GL_LINES
...
glEnd

glDisable GL_CULL_FACE

DrawMarker
DrawMarker
DrawMarker
DrawMarker

glBegin,GL_QUADS
...
glEnd

DrawMarker  <-- this one disappears
DrawMarker
DrawMarker
DrawMarker

glBegin,GL_QUADS
...
glEnd

glPopAttrib

- - - - - - - - - - -
-- DrawMarker

glPushAttrib GL_CURRENT_BIT
glColor3ubv
glBegin GL_QUADS
...
glEnd
glPopAttrib
- - - - - - - - - - -

The interesting thing is that if I either, in the DrawMarker part, not push 
the attributes or not set the color all markers are visible again.

If I make the above change for just the disappearing marker it appears, but 
than the next marker disappears.

In the DrawMarker code I've followed both the glPushAttib and glColor3ubv 
with glGetError, but those returned Zero for all markers.

I have no idea what is happening.  Does anyone know ?

Regards,
Rudy Wieser