looking in the changelog of mktoolnix
http://www.bunkus.org/videotools/mkv.../doc/ChangeLog
iirc. the behavior was changed with:
Quote:
2010-07-30 Moritz Bunkus <moritz@bunkus.org>
* mmg header editor: bug fix: If a file was loaded that did not
contain 'track language' elements and those elements were
unchanged then they would be set to 'und' upon saving. Now they're
left as-is, and when adding them to the file the drop-down box
defaults to 'eng' being selected as per Matroska default value
specifications. Fix for bug 525.
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so Released v4.2.0 or earlier,...