if any user turned on or of development mode ,user get hanged 

But I want to know onething, if any user turned on or of development mode ,user get hanged it showing blank page, at that situation I need to remove the user and need to recreate , Yes i can remove them from develope role instead of that any suggestions why looker behaving like this ( Now plan is I dont want to dissable that toggle mode, I dont want to run from actual issue ) why users get hanged any solution.    

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