c++ - OpenCv 2.4.11 - picture won't display -

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i have been trying load , display picture opencv 2.4.11 (debug) in vs 2013. problem picture won't display , can't figure out. displayed empty window filled gray colour. tryed display plenty of images, changing attributes picture loading etc. , looking same problem online. here's code:

static mat read_sample(const string& samplepath, int &label, char separator = ';') {     mat sample;     //sample = imread(samplepath, 1);     sample = imread("c:/users/honzik/desktop/kotel.jpg", cv_load_image_color);     waitkey(0);     label = 777;      if (sample.empty())     {         cout << "error loading sample!" << endl;         exit(1);     }      //namedwindow("mywindow", cv_window_autosize);     imshow("mywindow", sample);       //mat graysample;     //cvtcolor(sample, graysample, cv_bgr2gray);     //imshow("gray sample", graysample);      mat resizedsample;     resize(sample, resizedsample, size(92, 112), 1.0, 1.0, inter_cubic);     imshow("resized sample", resizedsample);      return resizedsample;      /*     iplimage* img = cvloadimage("c:/users/honzik/desktop/kotel.jpg");     cvnamedwindow("test", 10);     cvshowimage("test", img);     mat mat = mat(img);      return mat;*/ }


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