You need to get the select objects arrow. If you have the drawing toolbar in view, click on the icon that looks like an arrow. You should be able to then click the drop down and just delete it.
If your drawing toolbar is not displayed, go to: View | Toolbars | Drawing
Once you have deleted the object, make sure to deselect the Select Objects arrow in the toolbar or else you won't be able to click on cells.
Hope this helps!