Myst 3 Exile problem

[exoriare]

I've had a copy of this sitting on my shelf for years and finally decided to give it a go. It's a DVD version released as part of Myst: The Collection some years ago. Getting it running on a C2D MBP with Snow Leopard is a bit like trying to crack one of the game's puzzles. Having found that the installer wouldn't work properly I installed it manually, then I downloaded and ran the updater for OSX, then I played around with a script for fixing the jumpy sound. Now everything seems to work BUT: after a few screen transitions using the hand pointer it opts out of the app and back to the Finder. Command-tab gets me back into the app, but every time I click again, it jumps out. Has anyone out there got this game to run under 'modern' conditions? - i.e. intel with 10.6? Or anyone had this problem and been able to fix it?