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One thing is not very clear : did you only do the simulation, or did you really copy the cd on the fly when the simulation worked ? The simulation is very much like a real copy except the writing part, but not completely the same.
Oh, and with any modern buffer underrun protected cdwriter you can safely use the on the fly copy method with ANY speed. I'd advise 12 speed max, if only because when you do overload the one IDE channel, the buffer underrun protection will kick in so many times that it takes more time to do the copy than with 12 speed. However the copy will always be good (I have NEVER had a buffer underrun error in more than 500 written cd's).
As to your problem, it could very well be that there's a bug in Clonecd which crashed your writing to an image.
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