I upgraded to Firefox 3 this week, and now the Vault player doesn't work for me.  I'm running on 32-bit Linux.  The Flash player plugin (version 9.0 r124) is installed and working correctly, as I can use other flash-based apps.  I can still use the Vault player in Firefox 2 and other browsers on my machine.  I haven't tried it on any other OS yet.

Seth G.