Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
Gimp XWD image files have a zero-length comment field. We have a patch for ImageMagick to fix the problem you reported. Look for it in the Subversion trunk by sometime tomorrow. Thanks.