As of this morning, May 18, 2012 moving the map is not working in Chrome. I am using version 2.1.1 of the API but your examples are not working either.
Zoom does the same thing, the map ends up in the middle of the ocean.
Appears to be an issue in Chrome on both Mac and PC (running version 19.0.1084.46 m)
Tested in IE9, FF 12, Opera 11.64 and Safari 5.1.7 worked