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FTGL Pixmap font problem

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hello, I started recently using FTGL to do font rendering and I got a problem using Pixmap fonts, I sometimes get a black background http://i869.photobucket.com/albums/ab253/phook/untitled.png here's the code
FTPixmapFont font("arial.ttf");
	glRotatef(Vangle, 1, 0, 0);
	glRotatef(Hangle, 0, 1, 0);
	glTranslatef(-Cam.x, -Cam.y, -Cam.z);
	DrawText(1000.0, 770.0, &font, 28, "X: %.1f, Y: %.1f, Z: %.1f", Cam.x, Cam.y, Cam.z); // print the current position

		glBindTexture(GL_TEXTURE_2D, tex);

		for(k = 1, i = z.polis.begin(); i != z.polis.end(); ++i, ++k) // std::list<>::iterator i, int k
			DrawText(10.0, 800 - k * 25, &font, 28, "%d : %.3f", k, (*i).n.Dot(Cam - (*i).a)); // print how far away i am from the walls

and my DrawText() function
void DrawText(float x, float y, FTFont *font, unsigned int fontsize, char *format, ...)
    char *text = new char[256];
    va_list arg;
    va_start(arg, format);
    vsprintf(text, format, arg);
    FTPoint poz(x, y);

    if (font->FaceSize() != fontsize)

    font->Render(text, -1, poz);
    delete[] text;
can anyone help me get rid of the black background? :)

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