Window refresh problems

Hi - I am using a Radeon 9000 pro with the ATI drivers on my system. I was doing some of the simple examples in Computer Graphics Using Open GL. I have never had this happen before, but whenever I compile and run the program, id does what it is supposed to except that it keeps the underlying background as though a window trancparency were enables (I use enlightenment if that helps). Could somebody point me in a direction? I have no idea what could be causing this. If anyone needs to see my small progrma, here it is:

#include X11/Xlib.h
#include GL/gl.h
#include GL/glu.h
#include GL/glut.h
#include cstdlib
 
//carrots removed because message board thinks it is HTML
 
class GLintPoint{
public:
        GLint x,y;
};
 
int random(int m)
{
        return rand()%m;
}
 
void drawDot(GLint x, GLint y)
{
        //draw dot at integer point (x,y)
 glBegin(GL_POINTS);
                glVertex2i(x,y);
        glEnd();
}
 
void myInit(void)
{
        glClearColor(0.0,0.0,0.0,0.0);  //black background color
        glColor3f(1.0f,1.0f,1.0f);      //set drawing color
        glPointSize(2.0);               //dot is 4x4 pixels
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluOrtho2D(0.0,640.0,0.0,480.0);
}
 
void Sierpinsky(void)
{
        GLintPoint T[3]={{10,10},{300,30},{200,300}};
 int index = random(3);        //0,1,2 equally likely
        GLintPoint point = T[index];  //initial point
        drawDot(point.x,point.y);     //draw initial point
        for(int i = 0;i < 1000;i++)       //draw 100 dots
        {
                index = random(3);
                point.x = (point.x + T[index].x) / 2;
                point.y = (point.y + T[index].y) / 2;
                drawDot(point.x,point.y);
        }
        glFlush();
}
 
int main(int argc, char** argv)
{
        glutInit(&amp;argc, argv);                       //initalize toolkit
        glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); //set display mode
 
        glutInitWindowSize(640,480);                 //set window size
        glutInitWindowPosition(100,150);             //set wondow position
        glutCreateWindow("Sierpinski Triangle");     //open the window
        glutDisplayFunc(Sierpinsky);                 //register redraw function
        myInit();
        glutMainLoop();                              //Loop forever and ever
        return(0);
}
 
Any help or ideas would be appriciated.  I have no idea where to begin.  Thanks!

[shinpaughp]

You probably need a glClear( GL_COLOR_BUFFER_BIT ) call at the beginning of your Sierpinsky function. Otherwise it is probably some transparency setting with enlightenment...