Hi,
I've fixed the problem with tablature export.
Now with standard tuning there is no problem anymore. (With custom tunings, you'll need LilyPond 2.14+)
I'd like to know why the LilyPond team had changed this specification
You can download the latest update v2.71 b5c for Mac and for Windows.
Matthieu
PS: If you have a previous version of TablEdit and if you are in standard tuning, the most simple solution is simply to edit the ly file and to remove the "\set TabStaff.stringTunings ..." line.