dvdwizard 0.5.1 seems to have a small problem with spaces in the title's source file paths. In dvdwizardrc ffmpeg is called to determine the duration of the title however the command line misses the double quotes around the title path.
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sorry for answering that late, but I have been very busy with my real-time job in the past few months.
Thanks for your patch, I applied it in the darcs repository and will publish it in the next snapshot or release tarball. But you can check out the patches sources from the darcs repository at anytime.