Ian Watkins on 12 Oct 2016 18:31:59
Discussion here:
http://community.powerbi.com/t5/Service/Calculated-column-being-cleared-when-loaded-to-powerbi-com/td-p/73694
It looks as if the Table.ExpandRecordColumn command is not working (in this instance at least) on the Service. There are no problems on the Desktop.