Daffy_Doug It has happened to me also. In my case, it was just 3 minutes of a 5 minute video. Any ideas anybody?
[deleted] In this case, we will need more information in order to detect the source of the problem, like what's the operating system, the version of the software you are running? In this specific case please open a support ticket to http://www.nch.com.au/support/supportcontact.html?software=ExpressBurn&support and add very specific information.