Hi,
If you are a left handed player with the mouse buttons reversed in Windows, then there is a bug that makes the space part of the game next to impossible to play; with the bug seemingly depending on which screen you are in.
For example, in the VAB, the camera controls are tied to the left mouse button and the part placement on the right; which is fine, as you can still build your vehicle.
If you then move a rocket to the pad, the camera controls are then tied to the right mouse button, while your left essentially does nothing.
If you go into the map screen and tried to create a manoeuvre node, then both the manoeuvre node creation and camera are tied to the right mouse button; this effectively makes accurate node creation next to impossible, which is kind of a bit fundamental.
There is a workaround... Try and play the game right handed...