HI,
I'm not sure if this is the right place to go.  I have Finale 2012, mac 10.8.2, VDL 2.5.5, Kontakt 5, and the Write Score 2012a.1 templates.  
When I go to the Percussion Layout Selection box in Finale, there are no VDL instruments in there, just the standard Finale instruments.  When I was running Finale 2011, there were a bunch of VDL instruments in there.  I am not able to get any of the VDL percussion instruments to work (all the melodic instruments work fine though).  
One thing I did notice that is different from the 2011 templates to the 2012 templates is that in the FIN12_VDL255 Percussion Library folder, there is only a FIN12-VDL255 Percussion Library file and it is an Unix Executable File.  In the 2011 Library, there were 3 Finale Library Files.
Is that the issue?  I have reinstalled it several times, following the instructions very closely and nothing has worked.
Thanks for any help you can provide,
Nick