Kerbal Space Program

Using a standard stock AeroEquus craft, I have launched to the Mun and created an intercept trajectory. I can't fine-tune the trajectory though. The interface won't let me interact with the pre-intercept trajectory at all (for creating a new maneuver or performing a "warp to"). I can interact with the intercept trajectory and post-intercept trajectory though. The screenshots below show this (though the mouse pointer isn't visible, sadly):

My craft once the intercept burn is performed:
http://steamcommunity.com/sharedfiles/filedetails/?id=726699720

My mouse hovering over (anywhere along the line of) the blue pre-intercept trajectory - note no highlight over the line to indicate interaction:
http://steamcommunity.com/sharedfiles/filedetails/?id=726699592

My mouse hovering over the orange intercept trajectory - note the highlight spot, and I can interact to create a maneuver:
http://steamcommunity.com/sharedfiles/filedetails/?id=726699672

My mouse hovering over the purple post-intercept trajectory - I can highlight any spot on this line:
http://steamcommunity.com/sharedfiles/filedetails/?id=726699625

This has been reproduced on both Windows and OSX (the above shots were taken on OSX).