Problems with Ivy Generator?

I have been playing around with the Ivy Generator plugin and seem to be having problems with the leaves. They are tending to be pointing in the same general direction. I’m using Blender version 2.65a so I was wondering if something changed with this version to cause the plugin to have problems?

Here is a pic I rendered using the Blender plugin:

And here is a pic I rendered using Thomas Luft’s origional code, see how the leaves are positioned much more natually.

Am I missing a parameter on the plugin? Or is this a bug? Thanks,