live-build standardt iso image don't boot

[Eric Crastes <eric.crastes@gmail.com>]

Hi all 

I played with live-package and live-helper some years ago.
I stopped because I was not able to obtain what I want at this moment (not the fault of the tool) 

Today, I come back to try live-build.
So I installed it on my machine, start to read the manual and try the first tutorial.
$lb config 
#lb build 

So far so good, I obtain an iso image ! 
I tried to start it in VirtualBox, I had the menu but impossible to boot :-(

When I open the iso image, I found the script 'live.cfg' 

> default live
> label live
>     menu label ^Live
>     menu default
>     kernel /live/vmlinuz
>     append initrd=/live/initrd.img boot=live config

But in the folder /live files are named :
vmlinuz-3.1.0-1-amd64
initrd.img-3.1.0-1-amd64

my config:
Debian testing amd64
live-build        3.0~a39-1
debootstrap   1.0.37

Is it normal ?
How can I solve this issue ?

ericc