[FIXED! :)] The Curse of the Invisible Rocket Engine (Why are my parts transparent?)

[Starwhip]

Seriously, what is happening here? I've got an engine and a fuel tank that simply refuse to have a texture while in flight. And when switching back to the VAB, the parts are still invisible, but if I move anything they suddenly reappear.

The parts are still there, however, as proved below.

Any help would be appreciated.

EDIT:

Here's the config for the engine:

PART
{
//Part Config
//ModularBoosterSystem Nozzle 01

//--General Parameters--
name = mbs_nozzle1
module = Part
author = Starwhip

//--Asset Parameters--
mesh = model.mu
scale = 1

//--Node Definitions--
node_stack_top = 0.0,0,0,0.0,1.0,0.0,1
node_stack_bottom = 0,-0.5,0,0,-1,0,1

//--FX Definitions--
fx_exhaustFlame_yellow = 0.0, -3.57, 0.0, 0.0, 1.0, 0.0, running
fx_exhaustSparks_yellow = 0.0, -3.57, 0.0, 0.0, 1.0, 0.0, running
fx_smokeTrail_medium = 0.0, -3.57, 0.0, 0.0, 1.0, 0.0, running

// --- Sound FX definition ---
sound_vent_medium = engage
sound_rocket_hard = running
sound_vent_soft = disengage
sound_explosion_low = flameout

//--Editor Parameters--
TechRequired = start
entryCost = 0
cost = 400
category = Engine
subcategory = 0
title = Modular Booster System Nozzle 1
description = First Nozzle of the modular booster system

//attachment rules: stack,srfAttach,allowStack.allowSrfAttach,allowCollision
attachRules = 1,0,1,1,0

//--Standard Part Parameters--
mass = 0.4
dragModelType = default
maximum_drag = 0.3
minimum_drag = 0.2
angularDrag = 2
crashTolerance = 7
maxTemp = 3600 

stagingIcon = SOLID_BOOSTER

MODULE
{
	name = ModuleEngines
	thrustVectorTransformName = thrustTransform
	throttleLocked = True
	exhaustDamage = True
	ignitionThreshold = 0.1
	minThrust = 0
	maxThrust = 250
	heatProduction = 550
	useEngineResponseTime = True
	engineAccelerationSpeed = 10.0
	allowShutdown = False
	fxOffset = 0, 0, 0.12
	PROPELLANT
	{
		name = BoosterFuel
        		ratio = 1.0
		DrawGauge = True
	}
	atmosphereCurve
 	{
   	 key = 0 240
  	 key = 1 225
 	}

}

}

Edited February 10, 2015 by Starwhip

[sumghai]

The first things to check are:

- If you've modelled your parts in Blender, have you set the normals of the faces correctly?

- Assuming you're familiar with exporting parts from Unity, are you using the correct KSP shaders?

[Starwhip]

Right. Recalculated normals in Blender. I'm going to check the shader settings.

EDIT:

Oh. OOOOoooohhhh.... I've got Unity 4.3.4

Would that be a problem?

- - - Updated - - -

And now I can't see the export option...

EDIT2:

Progress! I had the hierarchy wrong!

Edited February 10, 2015 by Starwhip