I totally understand MechJeb devs being a bit overwhelm by the work needed to adapt their baby to the new functions of KSP 1.0. I have tried to recompile MechJeb myself to work with KSP 1.0.2 ... and miserably failed. my dll is 1MB while the orginal is 2.6MB, i'm probably missing something. That being said, i have loaded my save file without mechjeb loaded and KSP deleted all my ships fitting the case. I'm doomed. I guess i'll wait for any dev to have time to update the mod. I'll learn later, because i'm very willing to help.