sentences:  In August 2007, Caster resigned as CEO of Mannatech.In October 2007, it was reported that the company had fired Grant Thornton LLP as its auditor after the accounting firm demanded that Mannatech remove Caster from all responsibilities to be replaced by Wayne Badovinus as the new chief executive.Several corporate initiatives were undertaken, but after 17 months on the job Badovinus resigned in December 2009.