It was driving me crazy. When using IMFD (any version) and ShuttleA (original or UCGO), any time I did an undock via Ctrl-D (the norm), IMDB's autoburning would stop working. You couldn't click it. Also, it would throw out of range dV values. I spent hours trying everything I could, and I discovered that if you undock using Scenario Editior, all was well, everything worked. I think there is a bug in ShuttleA that when you undock, it doesn't update it's state correctly, and IMDB gets confused about perhaps the total mass of the vessel or something. I tried the normal undocking with XR and IMDB doesn't have the problem at all, so it must be a ShuttleA thing. Weird. Just FYI if anyone else had this problem..