I'm working on a 1.2.7 version now that corrects the bugs introduced in 1.2.6 and adds some new features.
To go back to the 1.2.5 version just download that and all you have to do is upload the file found at /includes/admin/shipping_export.php.
Overwrite the existing one in place and you're all set. The rest of the files are the same.
I've been working on a 1.2.7 version for some time now and hope to have it out soon but ran into a number of other projects that have taken the time.
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