Same problem here, when I upgraded to the 3.2 version. I try to zoom to a small extent, and the map zooms to an scale which is few decimal places smaller then the minimum scale. So, nothing is displayed. In the 3.1 version of the API, the map zoomed to the minimum scale.
This happened a few months ago when I tried to upgrade, too. So, I rolled back. But, now I really need to upgrade, and we really need a fix for this.