The bars on the chart are missing or not within ordinary scale. How can I fix?

You may have a drawing object that was added to your chart when viewing a different market or different expiration. 

Example:

To remove the object, click on the "Object List" icon on the left chart toolbar. Then, remove the object.

Left-click on the object and click Remove, or click Remove All.

If that did not help, right-click in the chart and go to View > Auto Min / Max Price. This will reset your chart back to Automatic scaling.