A Tip for fixing dissappearing borders
Hopefully this might help someone.
I had a problem with border-radius, in IE the borders would disappear, they'd be invisible.
Using the IE dev tool, I noticed that the css3-container element had a z-index set to -1. Sure enough if I disabled tht property the border would appear.
Looking at the source I notices this line in the updatePos method of the RootRenderer class:
s.zIndex = el.currentStyle.position === 'static' ? -1 : el.currentStyle.zIndex;
So I set the element with the border to have position: relative; and it changed the z-index value of the css3-container to auto.
And there was much rejoicing.