Numerous program settings are stored in the Adobe Photoshop CS5 Prefs file, including general display options, file-saving options, performance options, cursor options, transparency options, type options, and options for plug‑ins and scratch disks. Most of these options are set in the Preferences dialog box. Preference settings are saved each time you quit the application.
Unexpected behavior may indicate damaged preferences. If you suspect damage to preferences, restore preferences to their default settings.