Daniel - thanks for your help!

Right I have narrowed it down...

This problem only occurs with all tables in one .DBC - other tables in other .DBCs act normally...
I am using the Microsoft Visual Foxpro Driver and the version of Query is whatever ships with Office 2K...

The values show in Query as 1s and 0s...

I think it has to be something to do with the .DBC...

Any ideas?