Analysis disappeared from Simulate

I am having a very frustrating problem with Creo Simulate. I have 12 different conditions I am trying to study so I have setup an analysis for each one. I ran about half of them and got good results, but now the analyses are starting to disappear from the list. I have tried to recreate them but I'm getting the error message "The analysis "X" has already been defined. Please enter a new name."

Has anyone else seen this issue? Is there a way to make the analysis reappear or to completely purge the existing one so I can recreate it? Also, changing the name is not really an option because I have a specific naming that will become a disaster if I have to change.