Issue I506 [defect,core,resolved] Crash on failure to write temporary trajectory file (.trj). SIMION crashes on failure to write the trajectory (.trj) file (when retain trajectories is enabled). This can happen if the user doesn't have write permissions to the project directory. It should instead report an error message and not crash. This is related to Issue I408. Affects 8.0.4-TEST21 to >= 8.0.5-TEST23. Resolved in 8.0.5-TEST24.