Gillette Co.’s James Kilts disappointed some investors yesterday by issuing a lower-than-expected sales forecast and failing to sate their appetite for more information in his first meeting with analysts since becoming chief executive of the struggling razor maker in February.Boston-based Gillette, whose sales have been stagnant over the past several years, has the potential to post 3 to 5 percent annual sales growth in the long-term, Mr. Kilts said. Some on Wall Street were looking for at...