Problem with my diagram

I was about to add a relationship in my diagram when it is updating and everything is gone, my page has turned white.
Could anyone help me? Please, this is very important

Sorry for my english

Could you tell me more about what led up to the issue so that I can make better suggestions:
How many individuals have you entered onto your diagram/project?
Did you enter them by clicking on the diagram or by entering kin type strings or kin terms?
Are you the only person working on the data or is it shared amongst a number of people?