I run Fldigi on Linux and Windoz platforms without any problems. I have tried it on my Macbook Pro (vintage 2008) running Mavericks (OSX 10.9.5) and observe that the application crashes very frequently on transmitting. I am using the version 3.23.19 in combinaton with the flrig version 1.3.30. Newer versions do not alleviate the problem. My rig is an Icom IC-7200. Current rig settings cause no problems on my Linux or Windoz platforms. There is no RFI in my shack (I tested). I have managed to port almost all my ham radio apps to my Macbook running OSX, which is my new field laptop. I don't do windozs, and I don't want to get into installing Ubuntu on my Macbook so that I can run one or the other application. I do have a Windows XP on my aforesaid Macbook Pro running under Bootcamp. Fldigi and Flrig perform exceptionally well in this OS/hardware environment. Like I said, I want to kick the Windoz habit and want to delete this OS from my laptop. So, does anybody out there in radio land have an idea for me how to stabilze Fldigi under Mac OSX?