Okay, first thing first. I am running version 1.0.5 on Steam, no mods. I have no crash report, the game hasn't crashed yet and there are no screen caps because...there is nothing to capture.
On two separate missions, it won't let me place a maneuver node. I click on my orbital path but nothing happens. It only seems to happen when i am orbiting Mun, and sometimes it happens and sometimes it doesn't. I'll try to get a crash report next time it happens.
Here is the link for my system specs. http://download1490.mediafire.com/bczs6tw6h3rg/n45nbmefeqhoc9c/DxDiag.txt