If you find you are working with Dashboard Designer and Sharepoint 2010 and you have made some changes to the backend (ive tested with cubes/tables), they will not automatically appear consistently in DD. For example if you have a SQL Server table source and add some columns, when you preview the data the new columns will show up, however they wont appear as new “Dimension” items for use in scorecards for example.
The trick here is to edit the data source and re-pick your database and table/cube. This forces DD to re-evaluate the source and fetch new metadata. Fortunately you wont have to remap your Time Intelligence!