Whenever a caveat shall be filed or a dispute shall arise before the register concerning the probate of a will, the grant of letters or the performance of any other function by the register, he may certify, or the court upon petition of any party in interest may direct the register at any stage of the proceedings to certify, the entire record to the court, which shall proceed to a determination of the issue in dispute. No letters of administration pendente lite shall be granted by the register after proceedings have been removed to the court except by leave of court.