Yes, this is to eliminate you accidentally picking something else that is problematic. For example if you have Loquendo file and picked it while trying to use Nuance library, it give same symptom as what you described. Actually for testing pruposes, just put one file then there is only once choice and it will be that file.
If problem still exists, try recopying the library over again; if the files were corrupted when it was copied, it gives similar symptom.
Update: You originally said you were using 9.6.13.405512 (Primo Truck 2014), but now you're saying NextGen. The voice pack in this thread is very old and is for old Primo, not NextGen. So it's not guarantee to work with it; you might have to post in the NextGen thread that you're using from, so others might know and help you.
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