not sure if it's relevant, but i had a permissions/segmenting issue with RealPlayer8 and Firestarter AND the Flash sound missing. I did a reinstall of slack 9.1 ontop of the existing install, with no formatting of partitions or name changing, and changed my /home/miranda to root group, with disk,sys,mem,wheel thrown in, did a VERSION=current with EXCLUDE=gstreamer on swaret.
caveat: i am a newbie with a large axe, and i may not really know what i'm whacking with it. but somewhere in there i did something right.
a quick test is www.joecartoon.com.