(Yes, MacOS's nonexistent memory protection is to blame; I'll be glad when they start making native audio software for MacOS X, and compiling VST plug-ins for said platform too. Mind you, I'll also need a new Mac then, as my beige toaster doesn't want to boot MacOS X (probably because of the CPU upgrade).)
In other plug-in news, Roland have a VST version of their Sound Canvas module out; I'm thinking of spending the A$135 (with 3RRR subscriber discount) and buying it (I do have an ancient SC-55 module, but this is internal and VST-based, and thus more convenient; and you never know when you'll need some GM sounds).
That wasn't MacOS. That was the Apple Lisa. (It had proper multitasking as well, I believe. Then Apple tore the guts out of it and made MacOS.)
remember the days when MAC "OS" actually *had* memory protection built in?! nuff said