Hi Nicolas,
I just realized something about your fix that is creating a strange situation. I have a address_company field, and that field doesn't always show on the report. The report is exactly the same, with the same type of product, but when I export one product, that column will be included, but when I export another product it is missing. When I look at the database, that field is filled in correctly, so it isn't a case where there simply isn't information provided. Instead, the report just lacks that column.
Any suggestions?