Chrome 11.0.696.68 (0) seems to have some objections to the drag & drop functionality. Dragging a .mcr file onto the appropriate region on the page has Chrome download the file.
OK, I figured it out. It was working but I needed to use the arrow keys and the mouse to move to find the right view. If you are too far away the land disappears.
... Chrome was giving me security errors when I loaded it locally.