Natalie Gagliordi / ZDNet: Dropbox reports Q2 revenue of $401.5M, up 18% YoY, net loss of $21.4M, up from $4.1M and avg revenue per paying user of $120, up from $117 a year ago  —  The company said paying users now sit at 13.6 million, as compared to 11.9 million for the same period last year.