I've been updating numerous drawings to a large assembly that was originally modeledusing 2000i, under a series of, for sake of arguement, 99.. series numbers. The complete assembly was used to create another version using 02.... series numbers. Six months ago some of the drawnigs were rev'd up and had minor changes, everything saved, and regeneratedjust fine. Problem, I open some of the files now in WF3.0 and the changes are essentially gone including the changes when the drawing numbers went from 99... to 02... from many years ago. Everthing reverts back in time but the files indicate that they were last saved at the time and date I last saved. Has anyone come across this problem? If so were you able to correct it without the drawing files returning to prior saves? What causes the changes to revert back?