EXS 24 Logic Sampler Users Group

OK, when I reopen a project, all of the EXS24 instruments are there, 
but a random half or so of them don't load in any samples. In order 
to get these "ghost" instruments to load their samples, I have to 
first load  different instruments, then go back and reload the 
originals. Then I'll save as a different project, reboot, try the 
new project, but same thing keeps happening.

G4, OS 9.2.2, Logic 6.3.1   Any advice?   Thanks.