Hi wheable, it's because there are a couple of objects located a vast distance (about 58 million units) away:



To fix this, after loading your .3dm file, go to the Top view and push the "reset" button on the toolbar at the bottom of the viewport. You should then be zoomed to fit all objects and you can do a window select around the little spec on the left (indicated above) and delete it. After that do another view reset for all viewports by right-clicking that reset button and you should be able to work normally.

- Michael