Ghost auto-update not working

[benka]

Hi,

I am a newbie to Magic Lantern. I thought I would install ML to encourage my 12yr old son to do some time lapse.

I have the latest build (magiclantern-Nightly.2015Dec20.550D109) and have just installed it on my 550D. Everything seems to be working except when I have Auto-Update ON under the 'Ghost' menu, it the does update ghost image to the last photo taken.

All other settings are default.

Is this a bug? or am I doing something wrong?

Thank you in advance for the help.