I know this is an old topic, but…
I am using DVDA 5.2 on Windows 7 and trying to burn a project to DVD and Blu Ray.
The DVD project completed and burned okay using the internal disk drive but the same project (formatted for Blu Ray) would not burn onto an external Buffalo USB 3.0 BD drive.
It would burn the lead-in, then just sit there waiting to start burning tracks with no response.
Finally I just burned the ISO file to a BD using Roxio without any issues. Looking around the internet, there are definitely many others having issues with DVDA and burning to disk. Compilation is fine though.
It is not good enough to state that the user has some issues with his software setup. In my case, Roxio burned the ISO with no problems whatsoever.