How many times to we have to kick this dead horse?
The contracts were signed on a specific date. Any change to the contract is not a new contract, it is an amendment to the contract. The original contract date with the original meeting of the minds should be used. The amendments and their dates should be noted.
As far as the contract date being after the effective date, who cares. Most appraisas have a shelf life of four to six months, so if it within that time frame, I do not see a problem from an appraisal standpoint. A lender may have different underwriting criteria, but really if the effective date is on Monday, and the contracts are signed on Wed, as long as the property has not burned down, who cares.
Ever since FHA had this stupid rule about the inspection date cant be before the FHA number being issued, there has been unnecessary concern over the dates being used.