This is a problem that occurred before and Josh provided some instruction for deleting an environment and then when it reopens it stops. Working a very large model file in an xml (fsx) environment for distributed modeling. Data sets are very large and take a while to load. I do not want it to reload every time I reset the model but the check box is not working properly. There is a solution but I don't remember which user environment file or tree node has to be removed.