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Original Message (ID '46255') By Forum Moderator:
This problem usually occurs because a Mathematica startup file is out-dated or corrupted. You can usually resolve this problem by clean-starting Mathematica, instructions for which can be found at: Hold down Windows: Control+Shift keys Macintosh: Options+Shift keys and start Mathematica. Keep the keys held down until Mathematica opens. Linux: start Mathematica with mathematica -clean