As I normally do. In v4.5 and v2013, I click on the ASCII check box, then fill in the box with 009 (tab)., then I move onto tab two. When I come back to tab one, the check box is deselected. I run the test import and it fails because the field is greater than 15 characters. When I do the same process in v4.5 and v2013, the check selection holds. I've tried it on two separate systems with the same result. The source file is an Excel file saved as tab delimited. Way odd. Wish I had access to the KB to search....