OK, I've fixed the problem with new users. I had forgotten to add a default signature for them when they are added to the database. I also removed the possibility to delete or change the title of the default signature, since there should always be at least one signature.
Changes Since beta1 the files editsigs.php, editsigs.tmpl and languages/editsigs.php has changed, Step 10 has been clarified, Step 21 has been added and Step 5 has changed the text.
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