What rights or file access does the Administrator have that the user within an Administrator group not have? That will be your answer, as you have seen things work for the Administrator.
Perhaps if you run the CHKSYS.EXE utility while logged in as the user, you could find some more information. This system checking utility can check read/write access for locations that Adagio requires. If something fails, that is a place to focus on.
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Regards,
Softrak Tech Support