Android : DeviceMonitor - Sending Tracking request failed

I am using the latest Android SDK bundle for mac (adt-bundle-mac-x86_64-20140702).

I am getting these errors when I try to use adb. (Launching App, Debugging etc.)

[2014-08-15 09:54:39 - DeviceMonitor] Sending Tracking request failed!
[2014-08-15 09:54:39 - DeviceMonitor] Adb connection Error:EOF

DDMS is 23.0.2.1259578

Killing adb server and restarting makes the device (Nexus 4) appear in command line.

Mac Version is 10.9.4