[Plugin: NextGEN Gallery] jumping thumbnail

You need a fixed height settingin for the images, play at the best with firebug. i.e. :

nggallery.css (line 136)

.ngg-gallery-thumbnail {
float:left;
height:200px;
margin-right:5px;
}

It work now, Big thanks Alex, is there any version for WP MU?

NextGEN is ready for WPMU

great news, but where to download for WPMU version, I search from your site but didn’t find?

Thanks for the tip! Worked for me.