This has been discussed earlier on the forum. There is one thing that worked for a few of us but for the others we are still in the dark.
It seems that the Patin Couffin engine only installs properly if the regional settings of the operating system (Windows XP at least) are good for him. US English works for sure. So if you have other region on the computer that fails, uninstall Fab, set region to US English, install Fab again, and set to region to whatever you need.
Hope this works for you.