Your best bet is to reset the Adobe Photoshop Preferences. To reset the Photoshop preferences, do the following:
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Windows
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Start Photoshop.
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Once Photoshop is in the process of loading, press and hold Ctrl-Alt -Shift.
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When you see the “Delete the Adobe Photoshop Settings File” message, select Yes.
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Macintosh
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Press and hold Cmd-Option-Shift.
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Start Photoshop.
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When you see the “Delete the Adobe Photoshop Settings File” message, select Yes.
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