Unresolved Pointer References
When you try to save the model or load it into another model, you receive an error indicating that the model contains many unresolved pointer references.
Missing Elements
When you try to open the model, an error displays indicating that the model is missing many elements.
Security: Invalid Signature
When you try to load an executable file or add-in, a dialog indicates that there may be a security issue.
Security: Unsigned File or Add-In
When you try to load an executable file or add-in, a dialog displays asking you to verify its publisher.
Security: Signed File or Add-In
When you try to load an executable file or add-in, the software checks its security credentials, and a dialog asks you to confirm that you want to load it.
About Digital Signatures
When you try to load an executable file or add-in, the software checks its security credentials, including its digital signature.