1.8.1DPR is a developer preview release and should not be used in a production environment. If this is a production server I recommend that you restore from back ups to 1.8.0.2.If this is a test box you should report the issue on github, and/or update this thread with the information that we would require to actually assist you. Remember please help us to help you by reading and following the posting guidelines located in this thread: Please read before requesting assistance. Thank you.