I get a load of this in my /var/log/lightdm/x-0-greeter.log

** (python:2216): WARNING **: (../../atk-adaptor/bridge.c:793):adaptor_init: runtime check failed: (root)
[+153.88s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+153.88s] DEBUG: Starting authentication for user checkbox...
[+153.88s] DEBUG: Wrote 24 bytes to daemon
[+153.89s] DEBUG: Read 8 bytes from daemon
[+153.89s] DEBUG: Read 38 bytes from daemon
[+153.89s] DEBUG: Prompt user with 1 message(s)
[+154.25s] DEBUG: Setting keyboard layout to 'gb'
[+155.36s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+155.36s] DEBUG: Starting authentication for user alan...
[+155.36s] DEBUG: Wrote 20 bytes to daemon
[+155.37s] DEBUG: Read 8 bytes from daemon
[+155.37s] DEBUG: Read 34 bytes from daemon
[+155.37s] DEBUG: Prompt user with 1 message(s)
[+155.73s] DEBUG: Setting keyboard layout to 'gb'
[+248.67s] DEBUG: Providing response to display manager
[+248.67s] DEBUG: Wrote 16 bytes to daemon
[+301.85s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+301.85s] DEBUG: Starting authentication for user checkbox...
[+301.85s] DEBUG: Wrote 24 bytes to daemon
[+302.20s] DEBUG: Setting keyboard layout to 'gb'
[+304.32s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+304.32s] DEBUG: Starting authentication for guest account...
[+304.32s] DEBUG: Wrote 12 bytes to daemon
[+304.68s] DEBUG: Setting keyboard layout to 'gb'
[+307.69s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+307.69s] DEBUG: Starting authentication for user alan...
[+307.69s] DEBUG: Wrote 20 bytes to daemon
[+308.15s] DEBUG: Setting keyboard layout to 'gb'
[+308.98s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+308.98s] DEBUG: Starting authentication for user checkbox...
[+308.98s] DEBUG: Wrote 24 bytes to daemon
[+309.34s] DEBUG: Setting keyboard layout to 'gb'
[+309.59s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+309.59s] DEBUG: Starting authentication for guest account...
[+309.59s] DEBUG: Wrote 12 bytes to daemon
[+309.96s] DEBUG: Setting keyboard layout to 'gb'
[+312.79s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+312.79s] DEBUG: Starting authentication for user alan...
[+312.79s] DEBUG: Wrote 20 bytes to daemon
[+313.25s] DEBUG: Setting keyboard layout to 'gb'
[+318.37s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+318.37s] DEBUG: Starting authentication for user alan...
[+318.37s] DEBUG: Wrote 20 bytes to daemon
[+318.89s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+318.89s] DEBUG: Starting authentication for user alan...
[+318.89s] DEBUG: Wrote 20 bytes to daemon
[+319.12s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+319.12s] DEBUG: Starting authentication for user alan...
[+319.12s] DEBUG: Wrote 20 bytes to daemon
[+319.28s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+319.28s] DEBUG: Starting authentication for user alan...
[+319.28s] DEBUG: Wrote 20 bytes to daemon
[+319.45s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+319.45s] DEBUG: Starting authentication for user alan...
[+319.45s] DEBUG: Wrote 20 bytes to daemon
[+328.07s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+328.07s] DEBUG: Starting authentication for user checkbox...
[+328.07s] DEBUG: Wrote 24 bytes to daemon
[+328.44s] DEBUG: Setting keyboard layout to 'gb'
[+328.83s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+328.83s] DEBUG: Starting authentication for guest account...
[+328.83s] DEBUG: Wrote 12 bytes to daemon
[+329.20s] DEBUG: Setting keyboard layout to 'gb'
[+329.93s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+329.93s] DEBUG: Starting authentication for user alan...
[+329.93s] DEBUG: Wrote 20 bytes to daemon
[+330.40s] DEBUG: Setting keyboard layout to 'gb'
[+396.09s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+396.09s] DEBUG: Starting authentication for user checkbox...
[+396.09s] DEBUG: Wrote 24 bytes to daemon
[+396.41s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+396.41s] DEBUG: Starting authentication for guest account...
[+396.41s] DEBUG: Wrote 12 bytes to daemon
[+396.69s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+396.69s] DEBUG: Starting authentication for user checkbox...
[+396.69s] DEBUG: Wrote 24 bytes to daemon
[+397.03s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+397.03s] DEBUG: Starting authentication for user alan...
[+397.03s] DEBUG: Wrote 20 bytes to daemon
[+397.39s] DEBUG: Setting keyboard layout to 'gb'
[+397.51s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+397.51s] DEBUG: Starting authentication for user checkbox...
[+397.51s] DEBUG: Wrote 24 bytes to daemon
[+397.74s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+397.74s] DEBUG: Starting authentication for guest account...
[+397.74s] DEBUG: Wrote 12 bytes to daemon
[+398.00s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+398.00s] DEBUG: Starting authentication for user checkbox...
[+398.00s] DEBUG: Wrote 24 bytes to daemon
[+398.22s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+398.22s] DEBUG: Starting authentication for user alan...
[+398.22s] DEBUG: Wrote 20 bytes to daemon
[+398.58s] DEBUG: Setting keyboard layout to 'gb'
[+417.65s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+417.65s] DEBUG: Starting authentication for user checkbox...
[+417.65s] DEBUG: Wrote 24 bytes to daemon
[+418.00s] DEBUG: Setting keyboard layout to 'gb'
[+418.68s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+418.68s] DEBUG: Starting authentication for guest account...
[+418.68s] DEBUG: Wrote 12 bytes to daemon
[+419.04s] DEBUG: Setting keyboard layout to 'gb'
[+419.58s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+419.58s] DEBUG: Starting authentication for user checkbox...
[+419.58s] DEBUG: Wrote 24 bytes to daemon
[+419.85s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+419.85s] DEBUG: Starting authentication for user alan...
[+419.85s] DEBUG: Wrote 20 bytes to daemon
[+420.22s] DEBUG: Setting keyboard layout to 'gb'
[+457.34s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+457.34s] DEBUG: Starting authentication for user checkbox...
[+457.34s] DEBUG: Wrote 24 bytes to daemon
[+457.71s] DEBUG: Setting keyboard layout to 'gb'
[+458.95s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+458.95s] DEBUG: Starting authentication for guest account...
[+458.95s] DEBUG: Wrote 12 bytes to daemon
[+459.31s] DEBUG: Setting keyboard layout to 'gb'
[+466.40s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+466.40s] DEBUG: Starting authentication for user checkbox...
[+466.40s] DEBUG: Wrote 24 bytes to daemon
[+466.67s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+466.67s] DEBUG: Starting authentication for user alan...
[+466.67s] DEBUG: Wrote 20 bytes to daemon
[+467.03s] DEBUG: Setting keyboard layout to 'gb'
[+485.43s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+485.43s] DEBUG: Starting authentication for user checkbox...
[+485.43s] DEBUG: Wrote 24 bytes to daemon
[+485.64s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+485.64s] DEBUG: Starting authentication for guest account...
[+485.64s] DEBUG: Wrote 12 bytes to daemon
[+486.04s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+486.04s] DEBUG: Starting authentication for user checkbox...
[+486.04s] DEBUG: Wrote 24 bytes to daemon
[+486.40s] DEBUG: Setting keyboard layout to 'gb'
[+486.48s] DEBUG: unity-greeter.vala:494: Failed to write state: Error writing to file: Bad address
[+486.48s] DEBUG: Starting authentication for user alan...
[+486.48s] DEBUG: Wrote 20 bytes to daemon
[+486.84s] DEBUG: Setting keyboard layout to 'gb'