DineEquity (DIN) best known for its Applebee’s and IHOP brands had a particularly rough trading session on Tuesday. In fact the shares lost more than a quarter of their value.While the larger market decline almost surely played a role it seems evident that investors were troubled by the resignation of Dine’s CFO Thomas Conforti.The press release -- which frankly raises more questions than it answers -- said Conforti left to “pursue other opportunities.”But why would Conforti who’s been with the company for 6 years leave on apparently short notice? And why didn’t the company indicate he would work with ...