Actually running WP 3.0.3 but that's not in the options list.
The plugin creates an odd "jumpy" appearance to the site. I assume this has something to do with "width" as it creates an on-off-on-off effect generating and removing a bottom width scrollbar.
I first saw this happening on a friends site and re-confirmed it on my own (although its a little tougher on my site to verify the snow is infact falling since my site is mostly white, the bottom scroll bar issue persists). I'm personally on thesis, but she is/was not and I'm really not sure what her theme is.
I recently recommended the plugin in a blog post (which started this reporting) and in addition to those two sites I also have a commenter telling me that its broke on her site although she has not defined "not working" for me.
PS I'm subscribing to comments and available to assist with follow up as needed.