A state appeals panel has ruled that a law firm could still be held liable for legal malpractice — even after it was replaced with a new firm by the client — because it never formally withdrew its appearance in the case. The dispute stems from a 2004 lawsuit filed in Cook County Circuit Court by the Eleventh Street Loftominium’s association against the developer of its South Loop building. In 2008, the association hired John P. Jacoby, then an attorney with McDonald, Hopkins LLC. Jacoby and other …