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+1, also I was required to have episerver.config writable. http://world.episerver.com/forum/developer-forum/Problems-and-bugs/Thread-Container/2016/9/enabling-projects-requires-episerver.config-file-to-be-writeable/
Either enable projects by default or let us enable them through episerver.config and applicationSettings. Right now we always forget to enable it in at least one environment.