GcDago,
when you make comparisons between LV 5.0 and 7.0, are you referring to the same version of the Operating System?
I have no idea on how this LLB works or does, but staying with what you say, it probably calls Win32 functions that might be different on different OSes?
Probably the best thing you can do is asking for help also to who has developed this LLB.
Let me know if I can help further.
Regards,
AlessioD