Arduino YUN ATMega32u4 - Serial LEDs constantly rapidly flashing

[Working on Ubuntu 12.04, 1.5.5 IDE - loaded Blink example]

I programmed the ATMega32u4 on a new Arduino YUN through the AR9331 and then tried to connect using the IDE.

Using ssh, I logged into the AR9331 and then scp'd the Blink.hex file up to the YUN. I then tried to write the hex to the ATMega32u4 using:

% run-avrdude Blink.hex

After the code finished being written, the Tx LED was solid and then on the connection attempt from the IDE, both LEDs started rapidly blinking and the /dev/ttyACM1 disappeared.

This behaviour remains even after power cycle.

Does anyone have an idea as to how this can be fixed or even what is causing this? Did run-avrdude program over an incorrect region?