Mixedrealitytoolkit-unity: Play mode not starting, highlighting MixedRealityToolkit gameobject instead

[Alexees]

Describe the bug

It sometimes happens that I want to go into play mode, which I can't enter (exits immediately) and MixedRealityToolkit gets a ping.
I dug into where that comes from and it seems that the Active Profile is null then. I have to restart Unity for this to be fixed. Since this is a SerializedField with a proper value in it, I'm puzzled how this can happen.

To reproduce

I do not have steps to reproduce it yet

Expected behavior

The Active Profile never goes null

Screenshots

Your Setup (please complete the following information)

• Unity Version 2018.3.13f1
• MRTK Version v2.0

Target Platform (please complete the following information)

• Editor

[Railboy]

I was able to repro this once but I'm not quite sure how I did it.

I dug into where that comes from and it seems that the Active Profile is null then.

Yeah this seems to be the immediate culprit:

if (playModeState == UnityEditor.PlayModeStateChange.ExitingEditMode && activeProfile == null)
{
    UnityEditor.EditorApplication.isPlaying = false;
    UnityEditor.Selection.activeObject = Instance;
    UnityEditor.EditorGUIUtility.PingObject(Instance);
}

I have a suspicion ResetConfiguration is getting called by a dead / dying instance of the toolkit.

[Railboy]

I'm able to reproduce this consistently when using git to switch between branches while Unity is open.

• Create a new scene
• Use git to switch to / from prerelease/2019_rc1 / mrtk_development / other major branch
• Let Unity re-import assets and recompile
• Add a MixedRealityToolkit instance using _MixedRealityToolkit/Add to Scene and Configure_
• Select a configuration profile
• Try to enter playmode

The bug happens regardless of which branch I'm in.

Restarting the project or triggering recompilation makes the bug stop.

[Avalin]

Just a headsup, this issue is still relevant today.
I'm using Unity 2019.1.6f and MRTK RC1 Refresh.

I reproduced it like this:

• Add scene with MRTK integration (Playspace + Toolkit)
• Add new scene without MRTK integration (No camera).
• Start the new scene without MRTK integration. Stop it again.
• Go to scene with the MRTK camera implemented
• Try to enter playmode

(Also at step 2, this will trigger an aggressive pop-up telling you to add the MRTK Camera, switching to any other scene using the project manager will reopen this annoying window too. "Don't show this again" does nothing.)

As mentioned earlier, reopening the project temporarily fixes the issue. Using the PlatformSwitcher of the SpectatorView does too.

[Troy-Ferrell]

@Railboy is this fully fixed now? Can this be closed?