All my Vehicles from an old save say each stage has 0 Delta V

[Toasty Dyna-Soar]

I don't have pictures since I'm not at home, but all the vehicles from a save that I was accessing from a different computer but with the same mods, says that stages that have  fuel and the correct engine for that stage have no Delta V and the info thing is blank next to the Delta V for each stage when you expand it. 

[Toasty Dyna-Soar]

The engine does still work!