Hi John,
I'm experiencing your very same problem. After wasting a lot of time trying to understand where the problem was, I finally updated CloneBD to version 1.0.2.6
This solved only part of the problem. Now (on my system, at least) at the end of the processing phase the source disk is ejected without the annoying "disc removed" error, while there's a correct prompt instead requesting for a blank target.
The problem is that, upon insertion of a blank BD, I always get a message of "write fail" (don't remember the exact words) and I'm given the options of retrying with another disk or exit. But the retry option loops onto itself no matter what disc I insert, so the only way out is to cancel the operation (and throw away all the work done)
And, needless to say, it is very frustrating to have to wait some 3 hours every new try...
Reading around the forums it is clear that CloneBD is far from being a stable software, and developers are still struggling to debug it. But since other users report to be able to get a decent BD copy, I presume that there are also possible hardware and/or operating system compatibility issues.
I get that some users turned around the burning problems by creating an ISO image, checking it with a player software and burning it later with some image burning software, but I didn't have the time to check it personally.
By the way, the reason you get the error at 82% progress is due, in my opinion, to the fact that the progress indicator includes both processing and burning phases. So your 82% is the end of processing time, i.e. the moment when the source disc is ejected. The remaining 18% should be the burning time.
What is your HW and SW configuration? Since it looks like we're having the same problem, we could share our findings in order to find a solution.
Regards,
Roberto