background-attachment, help needed

Hello,

I’m trying to upgrade to Vaadin, version 7.3.1, directly from version 6.8. I noticed the background image, which used to move up when the browser was scrolled down, now stays in the same place. I tried it like this in .v-app:

.v-app {
background: #eee url(img/body-bg.png) repeat-x;
font-family: “Lucida Grande”, geneva, “Helvetica Neue”, “Trebuchet MS”, arial, helvetica, sans-serif;
color: #414141;
font-size: 13px;
overflow: visible;

background-attachment: fixed;

}

but there’s no effect. Then I tried the same thing inside the .v-ui block:

.v-ui {


background-attachment: fixed;

}

This time the background stays fixed, but so does the entire layout! When the layout is taller than the height of the screen, it can’t be scrolled down!

As far as I understand the background-attachment element should work, but it just doesn’t. I have tried everything but nothing seems to work. Can anyone please help?