Our application is card based with user driven exact positioning and it works extremely well with one small bug I have duplicated with the latest build in the dojo.
You can move the top left card around just fine. However, the first time you attempt to drag one of the other cards, it either becomes temporarily invisible or it jumps to another portion of the screen. After that, you can move that same card around without any issues.
Any thoughts on how I could fix this? It was an issue in the previous build as well.