Fixed my huge mistake.
Fixed my huge mistake.

--- a/Properties/AssemblyInfo.cs
+++ b/Properties/AssemblyInfo.cs
@@ -39,7 +39,7 @@
 // The assembly version has the format "{Major}.{Minor}.{Build}.{Revision}".
 // The form "{Major}.{Minor}.*" will automatically update the build and revision,
 // and "{Major}.{Minor}.{Build}.*" will update just the revision.
-[assembly: AssemblyVersion("0.17.1.*")]
+[assembly: AssemblyVersion("0.18.2.*")]
 // The following attributes are used to specify the signing key for the assembly,
 // if desired. See the Mono documentation for more information about signing.
 //[assembly: AssemblyDelaySign(false)]

--- a/VOIDCore_Generic.cs
+++ b/VOIDCore_Generic.cs
@@ -60,7 +60,8 @@
 		protected string VOIDIconOffActivePath;
 		protected string VOIDIconOffInactivePath;
 
-		private bool _useToolbarManager;
+		[AVOID_SaveValue("useToolbarManager")]
+		protected VOID_SaveValue<bool> useToolbarManager;
 
 		protected GUIStyle iconStyle;
 
@@ -95,8 +96,9 @@
 		[AVOID_SaveValue("timeScaleFlags")]
 		protected VOID_SaveValue<UInt32> timeScaleFlags;
 
-		// Vessel Type Housekeeping
+		// Load-up housekeeping
 		protected bool vesselTypesLoaded = false;
+		protected bool simManagerLoaded = false;
 
 		protected string defaultSkin = "KSP window 2";
 
@@ -314,39 +316,6 @@
 			}
 		}
 
-		protected bool useToolbarManager
-		{
-			get
-			{
-				return _useToolbarManager & ToolbarManager.ToolbarAvailable;
-			}
-			set
-			{
-				if (_useToolbarManager == value)
-				{
-					return;
-				}
-
-				if (value == false && this.ToolbarButton != null)
-				{
-					this.ToolbarButton.Destroy();
-					this.ToolbarButton = null;
-				}
-				if (value == true)
-				{
-					if (this.AppLauncherButton != null)
-					{
-						ApplicationLauncher.Instance.RemoveModApplication(this.AppLauncherButton);
-						this.AppLauncherButton = null;
-					}
-
-					this.InitializeToolbarButton();
-				}
-
-				_useToolbarManager = value;
-			}
-		}
-
 		/*
 		 * Events
 		 * */
@@ -383,29 +352,15 @@
 					this.useToolbarManager);
 			}
 
-			if (!this.useToolbarManager)
-			{
-				if (this.AppLauncherButton == null)
-				{
-					Tools.PostDebugMessage(this,
-						"UseToolbarManager = false (ToolbarAvailable = {0}) and " +
-						"AppLauncherButton is null, making AppLauncher button.",
-						ToolbarManager.ToolbarAvailable
-					);
-					this.InitializeAppLauncherButton();
-				}
-			}
-			else if (this.ToolbarButton == null)
-			{
-				Tools.PostDebugMessage(this,
-					"UseToolbarManager = true (ToolbarAvailable = {0}) and " +
-					"ToolbarButton is null, making Toolbar button.",
-					ToolbarManager.ToolbarAvailable
-				);
-				this.InitializeToolbarButton();
-			}
-
-			this.SetIconTexture();
+			if (
+				this.iconState != (this.powerState | this.activeState) ||
+				(this.VOIDIconTexture == null && this.AppLauncherButton != null)
+			)
+			{
+				this.iconState = this.powerState | this.activeState;
+
+				this.SetIconTexture(this.iconState);
+			}
 
 			if (this.Active)
 			{
@@ -475,7 +430,52 @@
 				}
 			}
 
-			this.CheckAndSave();
+			if (this.useToolbarManager)
+			{
+				if (this.AppLauncherButton != null)
+				{
+					ApplicationLauncher.Instance.RemoveModApplication(this.AppLauncherButton);
+					this.AppLauncherButton = null;
+				}
+
+				if (this.ToolbarButton == null)
+				{
+					this.InitializeToolbarButton();
+				}
+			}
+			else
+			{
+				if (this.ToolbarButton != null)
+				{
+					this.ToolbarButton.Destroy();
+					this.ToolbarButton = null;
+				}
+
+				if (this.AppLauncherButton == null)
+				{
+					this.InitializeAppLauncherButton();
+				}
+
+			}
+
+			this.saveTimer += Time.deltaTime;
+
+			if (this.saveTimer > 2f)
+			{
+				if (this.configDirty)
+				{
+
+					Tools.PostDebugMessage(string.Format(
+							"{0}: Time to save, checking if configDirty: {1}",
+							this.GetType().Name,
+							this.configDirty
+						));
+
+					this.SaveConfig();
+					this.saveTimer = 0;
+				}
+			}
+
 			this.UpdateTimer += Time.deltaTime;
 		}
 
@@ -609,7 +609,7 @@
 		{
 			GUIContent _content;
 
-			this.useToolbarManager = GUITools.Toggle(this.useToolbarManager, "Use Blizzy's Toolbar If Available");
+			this.useToolbarManager.value = GUITools.Toggle(this.useToolbarManager, "Use Blizzy's Toolbar If Available");
 
 			this.vesselSimActive.value = GUITools.Toggle(this.vesselSimActive.value,
 				"Enable Engineering Calculations");
@@ -741,39 +741,26 @@
 
 		protected void UpdateSimManager()
 		{
-			if (SimManager.ResultsReady())
-			{
-				if (HighLogic.LoadedSceneIsEditor)
-				{
-					SimManager.Gravity = VOID_Data.KerbinGee;
-				}
-				else
-				{
-					double radius = this.Vessel.Radius();
-					SimManager.Gravity = this.Vessel.mainBody.gravParameter / (radius * radius);
-					SimManager.Atmosphere = this.Vessel.staticPressurekPa * PhysicsGlobals.KpaToAtmospheres;
-					SimManager.Mach = HighLogic.LoadedSceneIsEditor ? 1d :  this.Vessel.mach;
-					BuildAdvanced.Altitude = HighLogic.LoadedSceneIsEditor ? 0d : this.Vessel.altitude;
-					CelestialBodies.SelectedBody = HighLogic.LoadedSceneIsEditor ? this.HomeBody : this.Vessel.mainBody;
-				}
-
-				#if DEBUG
-				SimManager.logOutput = true;
-				#endif
-
-				SimManager.TryStartSimulation();
-
-				Tools.PostDebugMessage(this, "Started Engineer simulation with Atmosphere={0} atm and Gravity={1} m/s²",
-					SimManager.Atmosphere,
-					SimManager.Gravity
-				);
-			}
+			if (HighLogic.LoadedSceneIsFlight)
+			{
+				double radius = this.Vessel.Radius();
+				SimManager.Gravity = this.Vessel.mainBody.gravParameter / (radius * radius);
+				SimManager.Atmosphere = this.Vessel.staticPressurekPa * PhysicsGlobals.KpaToAtmospheres;
+				SimManager.Mach = this.Vessel.mach;
+				BuildAdvanced.Altitude = this.Vessel.altitude;
+				CelestialBodies.SelectedBody = this.Vessel.mainBody;
+			}
+
 			#if DEBUG
-			else
-			{
-				Tools.PostDebugMessage(this, "VesselSimulator results not ready.");
-			}
+			SimManager.logOutput = true;
 			#endif
+
+			SimManager.TryStartSimulation();
+
+			Tools.PostDebugMessage(this, "Started Engineer simulation with Atmosphere={0} atm and Gravity={1} m/s²",
+				SimManager.Atmosphere,
+				SimManager.Gravity
+			);
 		}
 
 		protected void GetSimManagerResults()
@@ -959,17 +946,12 @@
 			this.GUIStylesLoaded = true;
 		}
 
-		protected void LoadVesselTypes()
-		{
-			this.AllVesselTypes = Enum.GetValues(typeof(VesselType)).OfType<VesselType>().ToArray();
-			this.vesselTypesLoaded = true;
-		}
-
 		protected void LoadBeforeUpdate()
 		{
 			if (!this.vesselTypesLoaded)
 			{
-				this.LoadVesselTypes();
+				this.AllVesselTypes = Enum.GetValues(typeof(VesselType)).OfType<VesselType>().ToArray();
+				this.vesselTypesLoaded = true;
 			}
 
 			if (this.SortedBodyList == null && FlightGlobals.Bodies != null && FlightGlobals.Bodies.Count > 0)
@@ -981,6 +963,18 @@
 				Debug.Log(string.Format("sortedBodyList: {0}", string.Join("\n\t", this.SortedBodyList.Select(b => b.bodyName).ToArray())));
 			}
 
+			// SimManager initialization that we don't necessarily want to repeat every Update.
+			if (!this.simManagerLoaded && this.HomeBody != null)
+			{
+				SimManager.Gravity = VOID_Data.KerbinGee;
+				SimManager.Atmosphere = 0d;
+				SimManager.Mach = 1d;
+				CelestialBodies.SelectedBody = this.HomeBody;
+				BuildAdvanced.Altitude = 0d;
+				SimManager.OnReady += this.GetSimManagerResults;
+
+				this.simManagerLoaded = true;
+			}
 		}
 
 		protected void InitializeToolbarButton()
@@ -1031,19 +1025,6 @@
 		protected void ToggleMainWindow()
 		{
 			this.Active = !this.Active;
-		}
-
-		protected void SetIconTexture()
-		{
-			if (
-				this.iconState != (this.powerState | this.activeState) ||
-				(this.VOIDIconTexture == null && this.AppLauncherButton != null)
-			)
-			{
-				this.iconState = this.powerState | this.activeState;
-
-				this.SetIconTexture(this.iconState);
-			}
 		}
 
 		protected void SetIconTexture(IconState state)
@@ -1087,28 +1068,6 @@
 			}
 		}
 
-		protected virtual void CheckAndSave()
-		{
-			this.saveTimer += Time.deltaTime;
-
-			if (this.saveTimer > 2f)
-			{
-				if (!this.configDirty)
-				{
-					return;
-				}
-
-				Tools.PostDebugMessage(string.Format(
-					"{0}: Time to save, checking if configDirty: {1}",
-					this.GetType().Name,
-					this.configDirty
-				));
-
-				this.SaveConfig();
-				this.saveTimer = 0;
-			}
-		}
-
 		public override void LoadConfig()
 		{
 			base.LoadConfig();
@@ -1168,10 +1127,8 @@
 			this.UpdateTimer = 0f;
 
 			this.vesselSimActive = (VOID_SaveValue<bool>)true;
-			SimManager.Atmosphere = 0d;
-			SimManager.OnReady += this.GetSimManagerResults;
-
-			this.useToolbarManager = ToolbarManager.ToolbarAvailable;
+
+			this.useToolbarManager = (VOID_SaveValue<bool>)ToolbarManager.ToolbarAvailable;
 
 			this.LoadConfig();
 

--- a/VOID_TWR.cs
+++ b/VOID_TWR.cs
@@ -3,11 +3,9 @@
 // This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. To view a
 // copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/
 
+using KerbalEngineer.VesselSimulator;
 using KSP;
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using ToadicusTools;
 using UnityEngine;
 
 namespace VOID
@@ -28,7 +26,7 @@
 				(TimeWarp.CurrentRate <= TimeWarp.MaxPhysicsRate)
 			)
 			{
-				KerbalEngineer.VesselSimulator.SimManager.RequestSimulation();
+				SimManager.RequestSimulation();
 			}
 
 			GUILayout.BeginVertical();