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Have a document open with no background. The transparency grid is gone and is all black instead. What happened?

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You're a bit sparse on detail. What file format is your document? Does it contain layers? What happens if you create a new transparent image in Photoshop - does it behave normally? – Mike Fitzpatrick Oct 5 '11 at 21:45

Try checking Edit » Preferences » Transparency & Gamut.

  • Grid size: Medium
  • Grid colors: Light
  • left color: #ffffff
  • right color: #cccccc

Or maybe you created a new document and in the 'New Document Window' you have the Background Contents set to Black or Background color.

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