Export Excel, column names dissapeared

When I make an export to Excel there are no column names filled in the export file. Somebody knows what i have done wrong?
1 answers

Is this happening while using the default Export to Excel functionality from a data-/templategrid? If you recently changed one or more columns and did a 'fast redeploy' (the "updating running project" feature) , try stopping the application and restarting it. Somehow the headers go missing whenever you do it in this specific manner.