launch c::b under ubuntu(kylin  ver 1604 ),  try  open the dialogs of  "Settings/Editor", "Setting/Env.."
. the dialog randomize been "frozen" (the dialog is blank). 
This bug is with these version 
1)  c::b version:   build with svn nightly build
2)  apt-get install from ubuntu.
3)  apt-get install from the un-offical ..
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and after "frozen", I have to kill the c::b process