Make sure you've got the latest version of the patch (available from the project page above) and try again. We've had some vague issues supporting the different formats of the game, but that particular one should be fixed now.



Edit: Upon further inspection, the problem stems from the fact that there are multiple different user disks around because you have to make one in order to play the game in the first place. This means the various disks around the internet will be more difficult to support. We'll see what we can figure out to remedy this problem, but for now, the HDM and HDI versions are more standardized and more easily supported.