Despecialized - burning to a blu ray question on a Mac

Running into an issue trying to burn the SW Despecialized version to a Blu-ray.  Toast 14 goes to a waiting window after I hit burn and then crashes 30 seconds later.  Using the aforementioned Toast 14 and a portable Samsung writer SE-506.   Going from .mkv hopefully straight onto disc for playing in my BD player.  Any tips?

If Toast is broken, is there another software way to do the same thing?

Or just use tsmuxer and imgburn to get it into native BD format.