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I recent made an exact copy of my grid install and database in order to create a development grid. The only issues that I have noticed are that inventory items created after Nov 28th 2014 are not accessible. While those before then are. When you try to use them you get a "no symbol" sign. If you check the properties of the item there is a lock symbol in the upper right hand corner. Also when creating a new item in the dev world it does not populate to the database. None of these issues are experienced on the main grid that the copy was taken from.