SIMION®
The field and particle trajectory simulator
Industry standard charged particle optics software
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SIMION 8.0 Issues/Bugs/Enhancements

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Issue I170 2006-04-25 [randomnumbergenerator,70,resolved]
  SIMION may freeze on startup with the message "Initializing Random
  Number Generator".
  This error can occur if the system has not been rebooted for more
  than 24 days.
  Also noted by kenn in 7.1beta.
  Affects 7.0.0 to 7.0.2; 7.1beta1 to 7.1beta7 (on loading workbench).
  Resolution:
    7.0.3 and 8.0beta8 should fully resolve this.
    Prior versions have a workaround of disabling reinitialization
      of the random number generator as described on
      p. E-15 of the SIMION 7.0 manual.  This was
      usually done by replacing the "c:\FILES.GUI" directory with
      the files in (http://www.simion.com/files/FILES.GUI.zip).
      Rebooting the system may also resolve this temporarily.

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