Issue I468 [feature,resolved] Improve responsiveness on PA load/save (Asynchronous I/O). Prior to 8.0.5-TEST1, the SIMION GUI would freeze and not respond to events while a large PA was loading or saving (which can be over a minute for large PAs stored on a remote network share), and it was not possible to cancel the load/save other than by terminating the process. Reported by tbraun-20080116 http://www.simion.com/discuss/viewtopic?p=2116 In 8.0.5, SIMION responds to events while PA loading/saving occurs, and the operation can be aborted by pressing the ESC key. See also OS X CrossOver note in Issue I463. Implemented in 8.0.5-TEST1. Update: 8.0.5-TEST29: Load PA files without applying read lock. Previous 8.0.5 versions had a read lock preventing two SIMION processes loading the same PA simulataneously. Confirm any cancel requests (ESC key) by user. Also, possibly improved error checking. Update: 8.0.5-TEST30: Fixed freeze on PA load/save, particularly under Win2K and Wine/Linux, though also could occur on XP (selecting "Help|Browse Documentation" menu item when loading PA). Reported by glync-20081124 Update 8.0.6-TEST10: Issue I558 fixes slowness introduced in 8.0.6-TEST8. "simion.debug.allow_asynchronous_io=false" can now be used to disable asynchronous I/O for debugging purposes. See also - Issue I560.