Encoding ProRes for Blu-ray

I have FCP 6.6 and Toast 10.0.3. I simply want to make a Blu-ray disc. I have a 720 24p movie. If I export is from FCP with the DVCProHD codec and bring it into Compressor it immediately gets all jaggy and looks like it lost half of its lines of resolution (before even assigning a target). So I exported from FCP using Apple ProRes 422 HQ. When I brought that into Compressor it looked fine. I compressed it and brought it into Toast to make a Blu-ray. I didn't have re-encode set to "Never" so it re-encoded it. Even re-encoded it looked 1000 times better than what happened with the DVCProHD blu-ray (which was completely unacceptable). But of course I don't want to to re-encode. So I dragged and dropped the ProRes clip straight into Toast to let it encode it and I get a -50 OSX error. So that doesn't work for some reason. So I took the ProRes clip and selected "Never" for re-encode and Toast just crashes every time. Short of upgrading to FCP7 I am at a loss of what to try next. Is any one encountering these problems? Know why ProRes won't MPEG-2 in Toast? In another post I read about an involved workaround for getting Toast not to re-encode which involved creating a disc image.

Thanks in advance.

-Thomas