After upgrading to Snow Leopard, I've noticed Shockwave 11 doesn't seem to work in Safari. I'm running Safari in 32 bit mode, too. The Shockwave installer pops up a "complaint" dialog that it is only supported on 10.4 and 10.5, but I am able to install it anyway.
It DOES appear to work with Firefox, so it is just a problem with Safari.
It DOES appear to work with Firefox, so it is just a problem with Safari.