Leonid Nemirovsky sends us a tip on resetting the Zoom and Pan commands.
"From time to time, when performing the Zoom command in AutoCAD, I stumble into a small problem. At a certain point it stops zooming out or panning. To resolve this problem, simply execute a Regen or Regenall at the Command prompt, and zooming and panning will resume."
Notes from Cadalyst Tip Patrol: From time to time you will need to zoom out farther than your drawing extents, but AutoCAD won't let you. The same situation occurs with the Pan command. Executing a Regen or Regenall resets the zoom and pan abilities.