I am having the exact same problem. I just posted on Gardenweb in the
hopes for a answer. My stem is strong the leaves have no
discoloration but the branches are curling. I also have new
blossoms. I did recently prune the plant and probably over watered.
I'm wondering if the plant is stressed.

http://www.flickr.com/photos/kumato/2330671324/

Picture of whats happening to my plants.

Sumilea