Case 1006700 Case 1006123 Possible duplicate of an existing bug - https://issuetracker.unity3d.com/issues/gameobject-isactive-crash-when-opening-specific-scene We have switched from two different versions of Unity to see if we can get past this bug (2017.2.1f1 & 2017.3.1f1) at first .3 seemed to work but not long after the bug would persist until Unity would crash. In our setup we have one scene "Persistent" which is where our UI elements and players sit. By opening Persistent in the editor Unity crashes and a manual revert/resync is needed to get everything back in place. (Of course if you have changes you've made before pulling you lose them all as you can't push without pulling) I've submit a few bug reports. I'm just hoping someone can help us get back on track.