I can open the file, but the scale will not open? What can I do to fix this?
There is a user guide you can use to learn how to mark up files. From my understanding, a PDF file needs to have all the security permissions set to allow before you can apply editing.
Use the following get to see how to properly mark up using Vu360: http://www.thebluebook.com/images/Vu360_helpguide.pdf
Additionally, check the video tutorials as well: https://goo.gl/JV1nLW