how do I get Rounded Corners to work on a ddblock in drupal 7?
I've used ddblock before with round corners.   I was able to do it all, across every browser, with the csspie module.  

But atlas you are using CurvyCorners. With this demo, they are only using 

.myBox {
    ....
    border: 3px solid #FFFFFF;
    border-radius: 20px 20px 20px 20px;
    ...
}


nothing to do with o-border, webkit-border, khtml-border, -moz-border, border-top-right etc.  half of these are browser specific  (ie -moz-border is for firefox only).