Toast 20 Pro stops BluRay DVD burn at 80%

I have been unable to get Toast 20 Pro to burn a BluRay DVD. Everything looks fine until it reaches 80% then it seem to hang.

I'm running Sonoma 14.6.1, Intel MacPowerBook 2019. I am using the new interface (well at least the latest one, looks like circa 2008). Anyone having the same issue or found a way to get Toast to finish the burn?