I had the same expierence with Passadouro 1995. I had 3 bottles, one normal and two half, all three were faulty. I think with this Port was something seriously wrong during the bottling (or maybe at fortification). All three smell like nail polish, it was for sure nor a bad storing either a cork problem.
"An one litre bottle [of port] is the right size for two persons, if one person doesn´t drink." - Dirk Niepoort