Since I seem to have broken the thread by pasting in the form which I can't open (so sorry - I don't usually have that great an impact) - let me continue here. I seem to be in more trouble than I thought. Having created a new form with a similar structure (but no visible documents.) I again get the error. There is surely no reference in the new form and apparently none in the original. I suspect this is more of a registry issue, and am going to see if I can either repair or reinstall Paradox. Please stand by (or voice an opinion - yours tend to be valuable.)