During the dot-com boom, Kleiner Perkins Caufield & Byers, the venture capital investment firm, all but minted money, making prescient early investments in Netscape Communications, Amazon.com and Google and delivering astonishing returns to investors. Along the way, it became a symbol of Silicon Valley. But the firm has hit a rough patch over the last decade, frustrated by unsuccessful forays into clean technology and by a catch-up effort to take later-stage stakes in social media companies. Kleiner has held a series of status-report meetings with its outside investors this year, acknowledging that recent fund performance “wasn’t great,” one attendee said....