[Plugin: NextGEN Monoslideshow] Width et Height not applied

I installed Monoslideshow as an extension of NextGen Gallery in a new WordPress site (3.1.2).

My problem : i respect the syntax [monoslideshow id=1 w=450 h=350] in my post but the image size is not respected at http://www.edelo.net/envision/?p=576

In the following three examples the images size is always the same (960×440) whatever the syntax :
– [monoslideshow id=1 w=450 h=350]
– [monoslideshow id=2 preset=’edelo’] (with fullscreen)
– [monoslideshow id=3 w=200 h=200] (with small images)
The 3 galleries are http://www.edelo.net/envision/wp-content/gallery/

It is just a little better if i add the following custom css :
.slideshow{
width: 100%;
}

Thanks by advance for your help

http://wordpress.org/extend/plugins/nextgen-monoslideshow/