It is happening for me, too. I am following the instructions for extracting an mp3 audio soundtrack from a movie, so I am using the DVD-to-Mobile Generic mode, creating a generic.xvid.mp3 file, using the settings recommended in the pinned thread. When I click Start, it immediately says task cancelled, and then prompts to Finish. I am using DVDFab v18.104.22.168 in Windows Vista Home Premium SP1, Intel Centrino Duo 2.18GHz, 4mb L2 cache, 4gb RAM, writing to a Fujitsu MHW2120BH hard drive. I am attempting to make a file from my backup copy of Farscape Season 1 Disk 4 Title 5.