EXS 24 Logic Sampler Users Group

I can't figure this out. I have a certain drum kit/EXS instrument 
that when I try and load I am told that this intrument is not found. 
I have used it many times in the past with no problems. It appears in 
the EXS window, I can see everything in the edit window, I can play 
the samples in the edit window, the file exists in the sampler 
instruments file, yet EXS won't recognize it to play. Anyone know 
what's going on? Using 5.5.

Dix