When I first start Spaz on OS X, it asks if I want to enter my password, and then it crashes! Why?
There is a known conflict with AIR 1.5 (which Spaz as of 0.6 uses) and Input Mangers like (but not exclusively) SIMBL on OS X. This is often used in unofficial Safari add-ons like Safari Ad-Block. You need to uninstall the InputManagers to use Spaz.
See this post on the Spaz-Users group for more information.