The Design Checker has checks for 18 potential problems. All of these checks are selected in the Design Checker Options. However, not all of these checks run at the same time. Which checks are used depends on the type of publication. For example, there are checks for Web publications that are ignored for a print publication, even if they are selected in the Design Checker Options dialog box.
The Design Checker has a predetermined subset of checks for commercial printing. You should make sure that you use these checks for the publications you will send to a commercial printer.