without the exact error messages, it is difficult to say what exactly the issue was.
One possibility is that the OrderFax column in the ps3_Orders table was created to not allow NULL Values, changing the OrderFax column to allow NULL values would probably fix the issue.
I will log a bug for the Order Fax column not having a binding in the store Order Summary behavior, and keep a look out for the issue in the future. Thanks for bringing it to our attention.