KSP 1.9 broke the ability to edit a second manuever node with GUI 'knobs'.
Prior to KSP 1.9, I was able to do the following. Now I cannot in KSP 1.9:
Step 1 - Add a maneuver node at some future spot of your orbit. It doesn't matter what the maneuver node is as long as it's something nonzero. Something basic like +10 dV retrograde will do.
<Do NOT execute the maneuver yet. Just leave it in your future.>
Step 2 - Add a second maneuver node at some point farther in the future, along the brown dotted line that represents the orbit you will have after the maneuver node from step 1.
Step 3 - Try to alter that second maneuver node in any way using the GUI draggable knobs: the prograde, retrograde, normal, anti-normal, radial-in, or radial-out knobs. Prior to KSP 1.9, you could. Now in KSP 1.9, you can't. The second maneuver node is stuck as dV=0 and can't be changed through the GUI.
<Note that you can change the second maneuver node through the type-in fields in the lower-left of the screen, just not by pulling the maneuver node's knobs.>
#14 Updated by boolybooly about 1 year ago
While you are fixing this bug I would like to draw your attention to the problem with planetary encounters not being predicted reliably because it is probably related to the node code and is really getting shockingly bad now and deserves priority attention. :)
#15 Updated by Dunbaratu about 1 year ago
I just got the KSP 1.9.1 patch downloaded and tried this. It looks like it is fixed. Editing the second (and third, etc) manuever node now works properly.
I'd change the status to "resolved" but it isn't under my control to do so yet, as it hasn't been set to "ready to test" by SQUAD as I type this.