I just encountered a wierd problem/bug with semiTransparent Alphas on the GLGraphics OffscreenBuffer.

It seems that whenever I draw something semiTransparent, it forces everything in that spot to be semiTransparent. and make the Texture seethrough, even though we might had a background or even no transparent objects lying underneith.

here is the problem nailed down in a sketch.
Here i draw full filled rect and a semitransparent rect over each other, the region, where the semi transparent crosses the full filled one, make the full filled also semi-transparent, and we can see the ellipse underneith the textured image.
well we shouldn't actually see the circles at all, scince the OffScreenBuffer has a black .background.

Here picture and code. any ideas!?

1. 
   import processing.opengl.*;
   import codeanticode.glgraphics.*;
   
   GLGraphicsOffScreen glg2;
   
   
   void setup() {
     size(640, 480, GLConstants.GLGRAPHICS);
       
     // Creating an off-screen drawing surfaces. The first one has
     // 4x multi-sampling enabled.
     glg2 = new GLGraphicsOffScreen(this, 200, 100);
    
   }
   
   void draw() {
     background(0);
    
   
   
     // In the off-screen surface 2, we draw random rectangles.  
     glg2.beginDraw();
    
     glg2.noStroke();
     glg2.rectMode(CENTER);
     glg2.background(0);
     glg2.fill(20, 50, 230, 255);
     glg2.rect(glg2.width/2,glg2.height/2,glg2.width/3,glg2.height);
     glg2.fill(20, 250, 0, 50);
     glg2.rect(glg2.width/2,glg2.height/2,glg2.width,glg2.height/3);
     glg2.endDraw();   
   
     fill(255);
     ellipseMode(CENTER);
     ellipse(width/2,height/2,400,400);
     ellipse(width/2,height/2,100,100);
   
     image(glg2.getTexture(), 10, 10, width - 20, height - 20);
   
   }