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I am having the same crashing issue. I have Skype 16.17.65 running on my 2016 15in Macbook Pro High Sierra 10.13.4 (17E202). Suddenly, when I launch Skype, it just crashes. I have tried to find that Library string but I do not have it. I removed the keychain SFB files. I even reinstalled SFB. Anyone having any success on this? I use this for work as my primary means of communications. It has never worked well but now it doesn't work at all! Thanks