Some problems with cvcam

Ok, I fixed my last errors (sometimes I'm freaking idiot)...
I forgot 
to put a '!' in the condition...
Anyway I've still some problems:
- 
cvFindChessBoardCornerGuesses() always fails to find the chessboard
- 
if I render the video in a window using cvcam, all others windows 
created with highgui seem to be busy and if I move them they don't 
refresh anymore
Could anyone answer to at least one of these questions?
Thanks to everybody

Here's my code:

bool calibrate(unsigned cam)
{
    const char *name= "Grayscale image";
    
    const int width= 4;
    const int height= 5;

    int npoints[]= { width*height };

    
float distortion[4];
    float homography[9];
    float translation[3];
    float rotation[9];

    CvMat mat1, mat2;

    static CvPoint2D32f 
img_point[width*height];
    static CvPoint3D32f obj_point[width*height]
=
    {
        cvPoint3D32f(1.0, 1.0, 0.0),
        cvPoint3D32f(2.0, 
1.0, 0.0),
        cvPoint3D32f(3.0, 1.0, 0.0),
        cvPoint3D32f
(4.0, 1.0, 0.0),
        cvPoint3D32f(1.0, 2.0, 0.0),
        
cvPoint3D32f(2.0, 2.0, 0.0),
        cvPoint3D32f(3.0, 2.0, 0.0),
        cvPoint3D32f(4.0, 2.0, 0.0),
        cvPoint3D32f(1.0, 3.0, 
0.0),
        cvPoint3D32f(2.0, 3.0, 0.0),
        cvPoint3D32f(3.0, 
3.0, 0.0),
        cvPoint3D32f(4.0, 3.0, 0.0),
        cvPoint3D32f
(1.0, 4.0, 0.0),
        cvPoint3D32f(2.0, 4.0, 0.0),
        
cvPoint3D32f(3.0, 4.0, 0.0),
        cvPoint3D32f(4.0, 4.0, 0.0),
        cvPoint3D32f(1.0, 5.0, 0.0),
        cvPoint3D32f(2.0, 5.0, 
0.0),
        cvPoint3D32f(3.0, 5.0, 0.0),
        cvPoint3D32f(4.0, 
5.0, 0.0)
    };

    static IplImage *gray= cvCreateImage(size, 
IPL_DEPTH_8U, 1);
    static IplImage *tmp= cvCreateImage(size, 
IPL_DEPTH_8U, 1);
    
    cvCvtColor(rgb, gray, CV_BGR2GRAY);
    
    
gray->origin= rgb->origin;
    
    cvNamedWindow(name, 1);
    
cvShowImage(name, gray);
    
    if(!cvFindChessBoardCornerGuesses
(gray, tmp, 0,
        cvSize(width, height), img_point))
        
return false;

    cvCalibrateCamera(1, npoints, size, img_point, 
obj_point,
        distortion, homography, translation, rotation, 1);

    cvSetIdentity(camera_mat[cam]);

    mat1= cvMat(3, 3, CV_32FC1, 
rotation);
    cvGetSubRect(camera_mat[cam], &mat2, cvRect(0, 0, 3, 
3));
    cvCopy(&mat1, &mat2);
    
    mat1= cvMat(3, 1, CV_32FC1, 
translation);
    cvGetSubRect(camera_mat[cam], &mat2, cvRect(3, 0, 1, 
3));
    cvCopy(&mat1, &mat2);
    
    mat1= cvMat(3, 3, CV_32FC1, 
homography);
    cvGetSubRect(camera_mat[cam], &mat2, cvRect(0, 0, 4, 
3));
    cvMatMul(&mat1, &mat2, &mat2);
    
    cvInvert(camera_mat
[cam], camera_invmat[cam]);

    trace(camera_mat[cam]);
    trace
(camera_invmat[cam]);
    
    return true;
}



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