TIFFWriteDirectory() fails on network drive

[Hsu, Justine]

The attached program tries to save a blank 64 x 64 TIFF image to specified path.
When the path specified is local, the images saves fine.
If the path is on a network drive on a Windows7, then it saves a corrupt file, even after applying this hotfix http://support.microsoft.com/kb/2732673 
Here is the relevant code:

        const int dim = 64;
        const int channels = 3;

        TIFF *tif = TIFFOpen(argv[1], "w");
        TIFFSetField(tif, TIFFTAG_IMAGEWIDTH,      dim);
        TIFFSetField(tif, TIFFTAG_IMAGELENGTH,     dim);
        TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, channels);
        TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,    1);
        TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE,   8);
        TIFFSetField(tif, TIFFTAG_PLANARCONFIG,    1);
        TIFFSetField(tif, TIFFTAG_PHOTOMETRIC,     PHOTOMETRIC_RGB);
        TIFFSetField(tif, TIFFTAG_COMPRESSION,     COMPRESSION_LZW);
        
        int i;
        for (i = 0; i < dim; i++)
        {
            TIFFWriteScanline(tif, buf + dim*channels*(dim - i - 1), i, 0);
        }

        TIFFWriteDirectory(tif);
        TIFFClose(tif);

Justine
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