If you have nested containers, each 100% width, they should all extend across the entire stage. I find instead that each gets offset one pixel to the right but only in Flash except in Safari. In HTML5 there is no offset. This is true in Windows FF, Chrome and IE using v1.19pr3.
Using v1.18.5 it happens in both Flash and HTML5.
You can see an example here: Container Offset Bug.
Is this a known bug? I could find nothing about it.