Lapman, I am not sure if this is supposed to be happening when you click all Salesforce Custom Buttons/Links, but it is definitely a Salesforce-initiated change. What worries me is that the issue described above is marked as “Fixed” for your Sandbox org, CS5, so unless there’s a separate issue out there related to seeing this message when you click on a Salesforce Custom Button/Link, then this may be Salesforce’s intended behavior.
