Sometimes you run into a bug in DataSet, or some other product. At this point, you have a couple of choices. You can work around the bug, or you can call CSS/PSS. Most people take the former route unless they can't figure out a workaround. When you call PSS/CSS, you sometimes get a patch (hotfix), either one that exists, or a new one produced to fix the issue that you have.
Wouldn't it be nice if you could cut out the middle step, and just download the patch? Now you can... See Soma's post for more information.
So if you are running into a bug, take a look and see if there isn't a hotfix that might help. Let me know if you find patches that have worked, or if the search was fruitless.