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.
ImageMagick looks for its coder modules in a path defined at build time or for the uninstalled version, relative to the MAGICK_HOME path. Are any modules in the folder `/im/lib/ImageMagick-6.3.0/modules-Q16/coders'? If so its possible ImageMagick did not find the JPEG library when ImageMagick was compiled.
Check your system and make sure the JPEG delegate library is installed before you try the portupgrade command. We always build ImageMagick from source and we're not familar with the portupgrade command so we may not be able to help further.