[imp] message 'There are no parts that can be shown inline.'

[Bruno Costacurta]

Hello to All,
I got the following message on some emails (I suppose MIME and/or HTML) :

There are no parts that can be shown inline.

I have to click 'Other options..' --> 'All parts' ..etc.. to view the email.
However in the IMP configuration the parameter HTML inline is  
*already* setup to True.

Configuration via file imp/config/mime_drivers.php :

...
$mime_drivers = array(
     /* HTML driver settings */
     'html' => array(
       'inline' => true,
...

Thanks for attention.
Bruno

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