PreSonus has had a few reports on this issue, and here is what we recommend.
-In the project page, right-click a marker and choose the option to "reset track markers to content"
-Go back to each of your songs that are feeding into your Project page, make a small adjustment, and then go back to the Project page and update all of your mastering files.
-Try creating a new project, drag your audio files in and burn from there.
-If you are on Windows, try turning off Burnproof, choose the option to test write, and choose the option to use a temporary image.
-Try burning at a slower speed.
If the issue persists, please log a support ticket from your my.presonus.com account using the "Support" button.