Well, I don't know how the next_result() method works, but it's not the same as the retrieve_blast() method, I would guess. A true value from retrieve_blast() doesn't necessarily mean there's a true value from next_result(), it seems.
Jeff japhy Pinyan,
P.L., P.M., P.O.D, X.S.:
Perl,
regex,
and perlhacker How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart