In Driver v. AppleIllinois, LLC, 739 F.3d 1073 (7th Cir. 2014) (No. 13-8029), the district court granted class certification, and the Seventh Circuit refused to review that decision. Defendant renewed its challenge to certification, which the district court denied. Although declining to permit review, the Seventh Circuit clarified when a second appeal from an order granting or denying class certification may be permitted. The court held that where the trial court has “materially altered a previous order granting or denying class certification,” the ruling of the district court may be a proper subject of a renewed Rule 23(f) appeal. The alteration must be material – the slightest change in class definition does not create a right to appeal. Here, although the trial court materially altered the class definition, the appeal nevertheless was improper because the defendant did not seek to challenge the alteration, but sought to challenge other orders in the case.