This is what we run into if a user has 3 or more Collaborator configurations...
When our users change their network password, once they open the Collaborator client (which has their old network password in their ClearCase configurations), it immediately locks their network account which then throws a validation error in Collaborator.
It would be better if you didn't have Collaborator auto validating upon open so that users have the chance to either remove these configurations, or edit them to change the password.
Also, I think it would be better to have a single place for the user credentials instead of in each configuration. That way the user would only have to change it in one place.