There appear to be at least a couple of other people, using completely different files, having this problem. One has posted in this thread only a few posts above this one. Another is a different thread but noted by me in the opening post of this thread.
Regardless of that I pointed out in the original post of this thread that the identical file, on the same computer, worked fine in Creator 2012 Videowave as well as in Microsoft Media Player. What is the only thing that changed when I loaded Creator NXT 6?
I will be pleased to entertain alternative theories that explain what else might be happening here.
I know this isn't tech support but I have seen them, in the distant past, jump in occasionally.
If nothing else, posting here helps the poor folks who google for issues similar to theirs and find that they are not alone.