John Kingsbury

When you allow access in Sage 50 US, it stores the signature of the program used to connect and grants permissions based on the program signature (not sure how the signature is generated, probably some kind of hash on the calling exe/dll). When you modify/rebuild the program, the exe/dll will be different so Sage 50 will pick up a different signature, and since it doesn't have any permission info for that signature, it will need you to grant permissions for the "new" program.