Check if you have "Display curve" option checked and "Don't display object smaller than" unchecked. You can find these options in Tools->Options->Display. Screen in attachment. I had the same issue and when I adjust these option like this then it was working.
Check if you have "Display curve" option checked and "Don't display object smaller than" unchecked. You can find these options in Tools->Options->Display. Screen in attachment. I had the same issue and when I adjust these option like this then it was working.