Help: PBO + pbuffer problem

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Original post by phantom code? btw, unless you have a very good reason, favour using the framebuffer object extension over the pbuffer one, its 'better' in most cases

//the PBO has been initialed beforevoid display(){    glClear(GL_COLOR_BUFFER_BIT);    glEnable(GL_TEXTURE_2D);    glMatrixMode(GL_MODELVIEW);    glLoadIdentity();    img = getNextImage();//upload texture to GPU with PBO    glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, texBuffer);>sizeX*img->sizeY*3, NULL, GL_STREAM_DRAW_ARB);    void *pboMemory = glMapBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, GL_READ_WRITE);    memcpy(pboMemory, img->data,img->sizeX*img->sizeY*3);    glBindTexture(GL_TEXTURE_RECTANGLE_NV,tex);    glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT);    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, img->sizeX, img->sizeY, GL_RGB, GL_UNSIGNED_BYTE, BUFFER_OFFSET(0));    glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);//render to pbuffer	    rt->BeginCapture ();    glDrawBuffer(GL_FRONT);    glBindTexture(GL_TEXTURE_RECTANGLE_NV,tex);    glBegin(GL_QUADS);    glTexCoord2f(0,       0); glVertex2f(-1, -1);    glTexCoord2f(0,    0); glVertex2f( 1, -1);    glTexCoord2f(0, 0); glVertex2f( 1,  1);    glTexCoord2f(0,   0); glVertex2f(-1, 1);    glEnd();    glDrawBuffer(GL_BACK);    rt->BindBuffer(WGL_FRONT_LEFT_ARB);    glBegin(GL_QUADS);    glTexCoord2f(0,       0); glVertex2f(-1, -1);    glTexCoord2f(1,    0); glVertex2f( 1, -1);    glTexCoord2f(1, 1); glVertex2f( 1,  1);    glTexCoord2f(0,   1); glVertex2f(-1, 1);    glEnd();    rt->EndCapture();    rt->BindBuffer(WGL_BACK_LEFT_ARB);    glBegin(GL_QUADS);    glTexCoord2f(0,       0); glVertex2f(-1, -1);    glTexCoord2f(1,    0); glVertex2f( 1, -1);    glTexCoord2f(1, 1); glVertex2f( 1,  1);    glTexCoord2f(0,  1); glVertex2f(-1, 1);    glEnd();}