TDMS List Contents returns groups for previously opened file

I get a directory listing of TDMS files, then loop through file by file, using TDMS List Contents to retreive the groups found in the particulare file.  I open each file, list its contents, and close it before opening and listing the next file.
If a file has no groups, TDMS List Contents returns the group list from the previous file.
How can I prevent this behavior?

Unfortunately, the original VIs were developed on a Classified system, so I can't include them here.  However, I've created similar VIs that demonstrate the equivalent problem.
Run the 'create files' VI to generate appropriate TDMS files, and the 'list contents' VI to demonstrate the issue.
Note that these VI's were created in LabVIEW 9 SP1 (Version 9.0.1 32-bit).
Thanks for taking a look it this!!
Attachments:
TDMS Issue Create Files.vi ‏18 KB
TDMS Issue List Contents.vi ‏13 KB

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