SIMION® Industry standard charged particle optics simulation software.
Newsflash: SIMION 8.1.1 is here: dielectrics, new examples + preview of permeability; ASMS2012 posters; major improvements to enhanced surface accuracy feature coming soon (details in Check for Updates).
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SIMION 8.0 Issues/Bugs/Enhancements

Filter issues by query: 
Issue I588 [defect,important,resolved]
  Fixed View screen crashing in drawing certain PA instance rotations.
  
  Affected 7.0.0-8.1.0.47 in rare cases but was more prevalent
  (and only reported) since 8.0.7-TEST5.  Only some PA's tended
  to be affected.  Resolved in 8.0.7.47 and 8.1.0.47.
  
  This improvement in theory might also have a very small
  improvement in particle splat detection in rare cases
  (Issue I223 - clip detection) because it shares the same code.
  
  Reported in a number of 2011 crash reports including 
    http://simion.com/discuss/topic/1223-simion-81047-2012-01-11-bugcrash/
  The temporary workaround there was to disable drawing of the
  affected PA instance (select PA instance on PAs tab and uncheck "Draw").
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