So I had an interesting support case the other day. I was adding another module to a GP instance on a workstation. After I had selected the instance to add the module to the next window, Add/Remove Features, was blank! I have never seen this before. I searched for an answer and found another article buried on the Microsoft Support site. Everyone should know this! It is Article ID 2581260.
My problem was a missing registry key value in the ‘Country’ entry. This entry is required in order to view the list of features. Of course I had selected the county on the initial workstation install but I don’t have an answer as to why it was missing in the registry.
Here are the steps to edit the registry. WARNING: Problems may occur if you incorrectly modify the registry. Back up your registry and modify at your own risk.