The Market widget might have to be re-added. The Android Market was recently changed to the Play Store and the widget might have change too.
What other widgets were affected?
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Google re-branded the Google Market and other applications to Google Play on March 6, 2012. If the Market is still available as an application on your device, access it. You will then be directed to a New Terms & Conditions screen. The update will occur over the air. You do not need to do anything else.
For additional information regarding Google Play go to: http://play.google.com/about/
If you do not have the Market application, click link below on how to download Google Play:
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