"Opened by" should display the name of the creator, but it instead displays "Client", even for accounts that it knows. I believe there may be some data cleanup from a bug fix required to resolve this issue for tickets created before April-2008.
Created attachment 307205 [details] Screenshot of behaviour
I confirmed that this still occurs for past tickets. We may need to correct some data to make any recent changes work properly for past tickets.
Closing my open Issue-Tracker requests.