iOS 4.2 Changes Orientation Lock Switch on the iPad to Volume Mute

Problem
After updating to iOS 4.2, the functionality of the orientation lock switch changed to a volume mute switch.

Fix

1. Open the multi-task bar on the iPad (push the home quickly two times)
2. Scroll until you see the orientation lock. The orientation lock is available as the first option on the multi-task bar (see image below)>
3. Touch the orientation lock one time to lock landscape orientation. Touch it again to unlock it.

Orientation lock on the left