In addition to Paul's request ..
- is the problematic column created as 'null' or 'not null'? what happens if you change the nullability?
- are you using a C# program that utilizes the bulk copy libraries? or are you using the 'bcp' command line tool? if using C#/bulkcopy-libs, what happens if you use the 'bcp' command line tool?
- what is a sample data row that fails during bcp in?
- what happens if you use the INSERT command to insert a row, bcp the row out, and then bcp the row in? success or failure?