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From inspector, try turning off NotEditable flag in object's hideFlags.
maybe related. https://forum.unity.com/threads/currentthreadismainthread-error-when-using-asset-bundle-loadallassetsasync-unity-2017-1-1.496051
Actually these functions doesn't seems to matter. AssetBundle.LoadAssetAsync and AssetBundle.LoadAllAssetsAsync both causes this error.
Update It works on 2017.2.0b5
Possibly related CurrentThreadIsMainThread() error when using Asset Bundle LoadAllAssetsAsync & Unity 2017.1.1
Tested with 2017.2.0b8 and 2017.2.0b11, It seems like async loading AssetBundle that contains AnimationClip causes this error. These functions...
How do I supposed to restart AnimationClipPlayable? Changing time property to 0 fires all AnimationEvents added to AnimationClip.
I don't see this issue anymore in 5.3. We are still stuck in 5.2 due to new bugs found in 5.3 though :(
Not perfect but workaround for us was avoid toggling UI when CPU load is high.
Did you find any workaround to this? We are seeing exactly same issue in our project after upgrading to 5.2 from 4.6.
Is there any ETA on next patch?
We are also having same problem. Can't use pre-cache workaround because our game uses many non-ascii characters. Hope this bug fixes ASAP