For our records and to help debug it... is this a mac laptop or desktop? How old is the mac and what OS version? How much RAM?
You might want to try making sure all other programs are closed that might be using memory and then really take your time between steps to allow memory to free back up. This will work sometimes, but this issue seems inconsistent which is why we have had trouble really narrowing it down or fixing it.
But we are aware of it and will be taking steps to get it corrected. Another option that slows things down but has worked for some people is to run the wizard and save a preset after each page is added. That way when it crashes you don't lose as much and can start back over from your last save.