I have been trying for days to see the same as you, but your small sample MTS file always works properly on my machine every time.
-I understand that your NXT 7 Videowave first loaded your MTS files properly, but then after a while would not load them any more. True?
-you tried NXT 6 Videowave, and that first loaded your MTS files properly, but then after a while would not load them any more. True?
I'm thinking that you must have the right drivers and CODECs, because Videowave loaded those files properly at the start. It looks like something is stopping the load process on your computer, after it identifies the MTS files. Here's what should happen in a second or two:
-The file selector or Windows first sees how many files you have, and starts to identify them. (Shows hourglass)
-Then it identifies the MTS files, and shows that MPGE symbol
-Then it decodes the files (or most of them) and shows a thumbnail picture on each file. (See that 00000.MTS is your file)
 First, NXT 7. How long did Videowave work properly before it stopped loading the MTS files? Did you change/install anything in your computer before it stopped working?
 NXT 6. Same questions. Also, does the NXT 6 computer have same operating system as the NXT 7 one?