cant switch to playmode with MixedRealityToolkit

Hi,

I have simply configured a existing Hololens-Scene with the new MRTK and wanted to test my scene in the preview. But I cant switch to playmode, because Unity simply highlights the MRTK Gameobject and nothing else. No error, nothing.

Ok it is a bug, but is it in MRTK or in Unity and what is a possible reason / workaround?

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Hi,
I had the project up and running for two months, built it successfully to the HoloLens, and suddenly the same thing happened.
Did anyone find a solution yet?
Regards

There is a GitHub Issue accordingly: Play mode not starting, highlighting MixedRealityToolkit gameobject instead · Issue #4121 · microsoft/MixedRealityToolkit-Unity · GitHub and might be caused by a second MRTK instance.
I restarted the editor and did not open any other scene, which solved the error.

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