This tutorial assumes you've created a job, added workareas, saved it, and suddenly your workareas seem to have disappeared. It's a simple fix.
Step by Step:
It's a one-step fix. Check the search box at the top of the left column. If there's any text in this box, it could be filtering out all your workareas. Backspace the text and that should bring your workareas back again.
If that didn't solve the problem, send us a message in the blue chat box in the lower right-hand corner!