One Drive's Directory List Is Replaced by That of Another

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Steps to Reproduce the Problem

1. Place a disk with files on it in drive A.
2. On the View menu, click Options, then choose Single Windows mode.
3. Open drive C and place it at the top of the screen. Consider this instance 1.
4. Below instance 1, open a second instance of My Computer. Consider this instance 2.
5. Double-click the drive A icon (instance 2).
6. Before instance 2 finishes its refresh, touch the windows of instance 1 (either on the title bar or somewhere inside; the important thing is making instance 1 active).