Can you share it here so we can troubleshoot it on file? Draw a square on world co. 0,0,0 (100;100 in) and when you use Zoom Extents do you still see the square, if not the obj is far away from world co. 0,0,0. -- This would be my guess. Transmutr is free for 7 days so try it to see if this solves your problem.
https://lindale.io/transmutr