Game crashes as soon as it is launched

Can any one help.
I have installed Monkey Island on a mac. episode 1. When I try to play I can get as far as the window that says Launch Game the it crashes.
The game has been completely removed with the preference file and reloaded again and this still happens.
It worked for a short time. Played up until I got on the Island then changed the screen resolution and not been able to get back in since.

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