I have a file that was done by another individual and when I updated what I needed to do on it I had certain levels turned on that were tied into the changes and saved the file. When reopening the file it reverts back to the Level that was being shown from the previous save. All my work is there both on the different levels and the toolpaths I worked on. Is there a setting that I am unaware of that keeps reverting back to the original level

We had a programmer leave and lost our post and machine definition for our Mori Seiki NH 5000 Horizontal mill what we have is faulting out when we go to post and it isn't putting in our B axis in correctly can anyone help