I cannot have two app windows open on my late 2011 MacBook Pro.

Say I have Pages open and I need to go to Safari for some reasearch. If I click on Safari, the Pages window will just disappear and then the Safari window will open. To make sure that this was just a settings issue, I logged out of my personal account and then logged in on the guest account. When I tried to have two windows open, there was no problem. I just need to know where I can find this setting on my computer because it's a very annoying problem. I can't even create another desktop and open another window there because it would still disappear. The perplexing thing is that it happened out of the blue. One day I could, the next day I couldn't. Somebody please help, Apple won't float me on this one (my tech-support expired).
If it helps, it has an Intel Core i5 with 2.4 GHz and 4GBs of RAM. I bought it refurbished from Apple on June 14 of 2011.

Back up all data.
Triple-click anywhere in the line below to select it:
defaults delete com.apple.dock single-app
Copy the selected text to the Clipboard (command-C).
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V).
Log out and log back in.

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