imshow() not working in pthread MacOSX 10.9

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Hello guys, here's my problem: on ubuntu 12.04 LTS with OpenCV 2.4.8 the following code works at 100%, in MacOSX (10.9.1), lastest version of Xcode (5.1) and OpenCV 2.4.8 i get a fully blank image and the program hang, if i move the cursor over the blank image i can see it "spinning" and the only way to stop the program is pushing the stop button on the Xcode interface. Another info: imwrite() within a thread works perfectly.

 void* test(void* arg);

 int main( int argc, char **argv )
 {

 Mat I = imread("/Users/Admin/Documents/X-Code/TestOpenCV/coin1.jpg", 1);
 imshow("1", I);
 waitKey();

 Mat I2 = imread("/Users/Admin/Documents/X-Code/TestOpenCV/coin2.jpg", 1);

 pthread_t h;
 pthread_create(&h, NULL, test, (void*)&I2);
 pthread_join(h, NULL);


 return 0;
 }

void* test(void* arg){

    imwrite("/Users/Admin/Documents/debug.jpg", *((Mat*)arg)); // WORKS!
    imshow("2", *((Mat*)arg)); // HANGS ON MACOSX
    waitKey();

    return NULL;
}