If it cannot find a Prefs file, Photoshop loads the default settings. When Photoshop is started, it looks for the Prefs file and loads the lastsettings. (It is not updated during a crash.) Because the file isrewritten so often, it is subject to corruption.

It is updated everytime you quit Photoshop. In addition to the options selected in the Preferences, the Prefs file storessuch settings as the positions of the palettes, tool settings, guide and gridsettings, scratch disk locations, and file saving settings. Instead of reinstalling theentire Photoshop program, you can often simply replace the'Prefs.' The Prefs: What They Are and How They Work Tools don'tperform correctly, commands don't execute the way they should, theinterface is mangled, Photoshop runs slowly or crashes oftenthese problemscould all be signs of a corrupted preferences file. Sometimes Photoshop doesn't seem to work quite right. Learn More Buy Photoshop Quick FixReplacing the Preferences Special Edition Using AdobeÂ® PhotoshopÂ® 7

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