v6.7.4

Fixed

• Send helper took 20 to 40 seconds. The console showed the helper arriving at once, but the
  app kept waiting. When you pressed Send helper while the app was also re-sending the helper on
  its own (after a reconnect, or to update it), two helpers started together and spent that time
  fighting over which one stays. The app now sends one helper per console at a time: a press
  during an automatic send waits for that helper instead of starting a second.