I have this bulbo, too. I bought the plant about 14 months ago with 6 leafless bulbs, 2 mature bulbs and 1 new growth. Three or the leafless bulbs got rotten, so I had to remove them. The plant developed 6 bulbs since I bought it. Two of new bulbs are leafless now (1st and 2nd from the left). Anyway, the plant has enough mature bulbs to bloom, bub it does not bloom yet.
I'll appreciate any advice!