I have not had this problem since I also have a piece of stem attached to leaf.

I now have a 1 foot tall plant from 3 leaves started YEARS ago.
East window, 3 leaves, never let them totally dry out. Buried half way under the potting soil. Very little fertilizer.
I tossed them after a year- that's when I discovered they had grown a little bulb, so I potted them back up and evenually they started sprouting on top.
You can see pics of this in one of my photobucket albums. maybe the one called tropical plants or houseplants. member name cheerpoeple there too.
hope it helps---
[IMG]http://i7.photobucket.com/albums/y256/cheerpeople/sequence%20of%20blooms%20Nov%20Sept%2008/IMG_4670.jpg[/IMG]

Here is a link that might be useful:

here's when I tossed them out after a year- then of course I repotted them when I discovered they had been doing something---

Here is a link that might be useful: