[Plugin: PostRatings] RSS wont sort most rated

i im having trouble with a plugin, i already asked the developer of it and he doesnt know how whats going on

i have a clean WP install right now with 4 test posts, also only have WP-PostRatings in there

http://rssjuice.net/tomorrow/?r_sortby=most_rated (works)
http://rssjuice.net/tomorrow/feed/?r_sortby=most_rated (doesnt)

so if anyone knows why it wont work on the /feed/
i really need this option for my site to be finished 🙂

* also it has the same effect with permalinks off
* im running wordpress 2.7 and WP-PostRatings 1.40 (also recommended by dev)