Kerbal Space Program

I often accidently click on parts I didn't intend to move (or was going to move but changed my mind) and my standard way to deal with this is to delete the part and hit ctl-z to ensure that it is put back exactly where it was. I noticed that doing this with KAL-1000 (or any set of parts including a KAL-1000) when the track editor is open results in the track editor no longer working after the part is restored with ctl-z.

To repeat:
1) place a suitable root part (e.g. SP-S06 Structural Panel)
2) place a KAL-1000 Controller
3) open the KAL-1000 track editor
4) select and delte the KAL-1000 controller with the track editor open
-> the track editor window goes away
5) type ctl-z to restore the KAL-1000
6) try to open the track editor again by any method
-> the track editor will not open until the craft is saved and loaded