V6 introduces different behaviour (and probably worse behaviour) than what previously existed.
This refers to when you have a query and you hit the little icon on the top right of the grid to "Export query results to CSV"
Prior Versions:
It would export ALL fields, regardless of if they were 'Hide column initially' or 'Show column initially'
Version 6 (build 2020):
It will only export fields if they are 'Show column initially'
This is not as useful, because to allow a user to export a field, you MUST have it 'Show column initially' - so to give them lots of options you have to have a messy user interface with lots of columns.
Is this is a bug? Any chance of having it go back to the old way?