The DTP70 does have a UV filter on it to compensate for optical brighteners that fluoresce in the UV spectrum, if you are trying to profile for paper that DOES contain UV brighteners and the filter IS NOT engaged then Profile Maker will over compensate making the whites yellow. You must manually engage and disengage the filter by pushing a lever located on the scanning head.
Read this about compensating for UV brighteners
http://www.xrite.com/product_overview.aspx?ID=674&Action=support&SupportID=3511
Read this about how to engage or disengage the UV filter on the DTP 70
http://www.xrite.com/product_overview.aspx?ID=674&Action=support&SupportID=3143
You may need to download Colorport in order to center the scanning head so that you can engage the UV filter. You can do that here:
http://www.xrite.com/product_overview.aspx?Action=support&ID=719