[Roy Dennis]

This is just a suggestion, ( I can not try this myself as I have no Leading Zero book id's to test it on) save a copy of all the duplicates with leading zero's some where completely different, like make a new folder called duplicates just so you have a reference if this does not work. From the edit songs option select multiple, make sure only book ID is highlighted. In the search just type one zero and press search, now it may list any number with a zero in it. Now click on the header bar for book Id and it should list them all in order either oo to 9999 or reversed, if reversed click header once more to make it start from 0. Now highlight all those with leading zero's only and delete them. Now try rebuild songs and see if this corrects the problem or does it again show leading zero's. If the search on zero doesn't work try * which will list all files.