I am using Finale 2010b with Virtual Drumline 2.5.2  I was previously on Mac OSX 10.4.11, but recently upgraded to Snow Leopard 10.6.2  Ever since, when using speedy entry with Finale, I cannot hear the sounds playing as I hit my midi keyboard on any of my staves.  All of my music playback fine through Virtual Drumline and Kontakt with Finale.  But, I am not able to hear the notes as I am entering music into the staff.  Any ideas? 

Sounds like you don't have MIDI Thru properly configured.

-Go to MIDI/Audio -> Device Setup - MIDI Thru
-Select ";Smart";
-Hear your wonderful VDL sounds playing back as expected!

Hope this helps.

Thanks Bryan.  That was the ticket.  I knew it was a small something somewhere inhibiting communication!