Kerbal Space Program

For no obvious reason I'm no longer able to create maneuver nodes despite using them without any problem earlier in the same flight. I don't have any mods installed nor have I ever used one. This seems to be a really common (and often very frustrating) issue that's been around for so long that a lot of people seem to have just written it off as "deal with it". The issue seems to reach different degrees of "brokenness", where sometimes it can be fixed by adjusting the camera angle and other times it's just plain impossible to create a maneuver node at all. The issue seems to be exacerbated (but not caused) by orbits being similar to one another. There are several workarounds that are often suggested and one of them usually works:

- Have a Kerbal do an EVA and then board again; even just getting on the ladder is fine

- Switch control to a nearby ship and back again

- Quicksave + quickload

- Leave the flight in progress, go to the tracking station, then take control of the flight again

- Make a slight course adjustment

- Exit the game and restart

- Shift the camera around until it works (doesn't usually help when it's become truly "broken")

- Use a mod to set a maneuver node for the distant future, then move it back

Here's a custom Google search set to a date range which ends prior to 0.9's release (to avoid confusion about upgrading the tracking station) but unfortunately there's still a lot of irrelevant results:

https://www.google.ca/search?q=ksp+can%27t+create+maneuver+node&espv=2&biw=1604&bih=894&source=lnt&tbs=cdr%3A1%2Ccd_min%3A2010-01-01%2Ccd_max%3A2014-12-01&tbm=#tbs=cdr:1%2Ccd_min:2010-01-01%2Ccd_max:2014-12-01&q=%22kerbal+space+program%22+can%27t+create+maneuver+node

Here are a few results from the KSP forum:

http://forum.kerbalspaceprogram.com/threads/78022-Okay-this-is-weird-and-really-annoying

http://forum.kerbalspaceprogram.com/threads/41592-Can-t-plan-a-manuever-on-the-blue-trajectory

http://forum.kerbalspaceprogram.com/threads/84602-Cannot-Create-Maneuver-Node

I'm setting the priority to "high" as this is a long-standing bug in a critical game system and it would reasonably be expected to function reliably in a "1.0" release.