By Lionel Laurent PARIS (Reuters) – Mark Karpeles, CEO of failed bitcoin exchange Mt. Gox, was a bright child, but a poor student, a lousy communicator and “too conciliatory”, allowing others to take advantage of him, his mother Anne said in a telephone interview. Speaking from her home in Switzerland last week, Anne, 57, said Karpeles was a “terrible” student, but was admitted to Mensa, a global society of those with a high IQ, as a teenager. Mt. Gox, at one point last year the world’s biggest exchange for the bitcoin digital currency, filed for bankruptcy protection in Japan in late February, blaming hacking of its computer system for the loss of bitcoins worth more than $450 million at today’s rates. Recalling Karpeles’ early days in Dijon in the Burgundy region of France, his mother said: “Difficult, never.