yes, each has the "cat":""
Here are some facts:
- if you create a category, but do not use it, then the export window is empty -- nothing at all to select, even though all of the uncategorized text still remains
- without any categories, the export window shows the undefined entires, they can be selected or de-selected, but output is 0-byte file
- if you create at least 1 category, and assign some text entry to that category, then export works correctly for all entries (including the undefined ones)
With that info, you should be able to solve the problem. Let me know if you need me to check anything else.