After importing the Master Incident package, opening any incident results in an error:
Unhandled exception: Error: Invalid link field definition: No relationship is associated with the link related object specifier link:MasterIncidentLink of Incident#.
In some situations importing this package can create a discrepancy on the newly created link field and relationships.
Support has analyzed this issue in our lab and created a package that should repair the problem. Please download and import the attached package.