AS 2.0 and flash player 8 support in CS3

I just upgraded to CS3 and I’m having issues.

I’m trying to bust out a new project quickly in AS2.0, but it’s throwing a lot of basic framework object errors:

The class or interface 'Array' could not be loaded.
function split(delimiter:String, limit:Number):Array;

I’ve tried putting the project together in Flash 8 which is still installed, but it can no longer compile and simply crashes instead.

What gives? Did anyone else encounter this?