I fixed the problem by adding a title and a tgroup element to the table as per Norman's excellent book. [Which I bought].
The XXE program should not crash like that although I understand that the file I supplied is outside the 'correct' range of input. It is difficult to get everything right. Robustness rocks! Have I mentioned what a terrific product I think XXE is ? -- John Austin <jwaustin at sympatico.ca>

