program outside screen

Do you have multiple monitors?

Try this:

Go to System preferences » Displays and then change the resolution.

This should force your computer to render the display again and reposition all open windows. Then just switch it back to your original resolution settings and everything should be back in to place

Are you using more than one monitor?

System Preferences > Displyas > Arrangement and check the mirror displays box if it isn't grayed out.

System Preferences can get corrupted, or if there was a second display it got stuck there. The PLIST file deleteion will reset your settings.

From Finder Go menu hold down option

Library > Preferences and delete com.apple.systempreferences.plist

Log out then log back in

Open Terminal, copy and paste this:

chflags nohidden ~/Library/Preferences/com.apple.systempreferences.plist

Then try checking again

Don't run any shell commands, and don't delete any preference files.

Click the X in the upper right corner of the space in Mission Control to close it. What happens?

If what Linc said doesn't resolve it, get the app in the foreground/active, and at the top of your screen, click Window >> Zoom.

Open mission control, hover your mouse in the upper right, click the + to create a new desktop. Try to drag its window to the new desktop at the top, then click that desktop.

Check to see if it is listed in Activity Monitor and quit process.

If not, try to Safe Boot and delete the app.

To start up into Safe Mode (to Safe Boot), do this:

Be sure your Mac is shut down.

Press the power button.

Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.

Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).

Here is a link to an App that I use to remove apps. It will find any files related to the app and remove them.

http://www.freemacsoft.net/appcleaner/#

Launch the Activity Monitor application. Find the errant process and quit it, by force if necessary. Then either uninstall the application or refer to its developer for support.

Whatever you do, don't install "AppCleaner."

When you activate Mission Control, does the program slide in from the side of the screen, or does it just appear?

As lmp68 mentioned, you should be able to use the Window menu for the program to maximize it, or even bring windows to the main display if that option is available.

However, if this does not work, you can try the script outlined in this article to gather all windows on the main display: http://www.jonathanlaliberte.com/2007/10/19/move-all-windows-to-your-main-screen /

Alternatives might be to attach a secondary monitor and toggle between mirroring and extended desktop modes.