I have made this a minor error only because it is so common.
The problem is that offsets inside the maker notes are not
handled correctly by most software. This is because the
maker notes aren't part of the EXIF standard (frankly, this
is a real flaw in the standard). So this problem will only
effect maker note (and any derived) information.<br
/><br />
ExifTool can read these damaged files correctly 90% of the
time with the -F option. If you edit the file with
ExifTool, be sure to use the -F option as well, or some
information may be lost. However, the new file will still
require the -F option to read properly. I am currently
working on this area in the code: I would like the -F
option to repair the damage when the file is rewritten, and
if possible I want it to be applied automatically if I can
improve the detection logic to be 100% reliable. But this
is very difficult because, frankly, many maker notes
structures are written improperly, and it is a challenge to
handle all of the special cases.<br /><br />
The alternative is to use ExifTool to write the XPTitle and
XPKeywords, then the maker notes won't be corrupted in the
first place. 
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