Version 0.4.13a, on MacOSX.5.7 the application quits after the login window, without any alert or report, it justs don't start if the shared folders have been moved.
It also does this when the files inside the folders have been changed, I can't find out in what way exactly it makes a problem. In the first case I only have to put back the folder, but in the second I have to remove the .pqiPGPrc/ft_shared.cfg file and re-add my shared folders.
Hope it can help.