I just complied a HD BD version of my last (downconverted to DVD)project; a couple of modifications to the menu system were required (color sets that were OK with the DVD version didn't work with BD) -- but anyway, the project is ready now, and previews well.

However, when I try to prepare it (not to mention burn) - after the initial set of checks and messages (which are in favour - no fatal errors), just when DVDA starts writing the .iso or burn my BD-RE disk, the message is displayed:

Warning. An error occurred while writing a file.
An invalid argument was specified.

- and even it's just a warning (not a fatal error), my only option is press the OK button which of course abandons the preparation task.

Never happened to me before; any advice?