Rockbox

I downloaded the doom.WAD file from the extras page on rockbox.org
When I run Doom I get the menu and can change settings. But when I click "Play" it runs some dialog on the screen then stops on "Starting Graphics engine"

The full text on the screen is:
S_Init: Setting up sound.
HU_Init: Setting up heads up display.
Starting Graphics engine

The only way I can find to leave this screen is to hold Menu + Select until rockbox reboots.

The Build I am using is: 9dd2eb4-120729