I am turning in circle !
As PeterT said, i found a check box to clear empty shelves... and it worked... but it cleared "auto bookshelves" shelves too... So i have deleted the autoshelf md5sum and launched "auto bookshelves" again, but it tells me "already done"... and did nothing
Sorry... I hope you're not tired to help me
Edit : I missed your answer, yes i am still interested tshering, thank you.