I had the same problem. After several tries I decided to NOT make a disc image before rendering to Toast. The product then worked fine, and as a matter of fact I made three more Blu-Rays, but I rendered each one separately through Toast. Each works fine. I also throttled toast to a maximum burn speed of 4X, and the Toast process ended up throttling it even more to 1X. That could have been an issue as well. So..... Did you make a disc image first and render through Toast from that? If you did, try just going straight through Toast and let us know what happened.