help i can't run reason 5 on lion!

I just got a new mac book pro with lion and I went to install propellorhead's reason 5.0 and it installed fine....howevery, every time i try to open it i get a "failed to open midi support library" message. This is extremely frustrating and I can't even look at the midi window in the audio midi setup. is anyone else experiancing a similar problem or know how to restore the audio midi drivers? I've already tried reinstalling reason about 5 times now...and i'm trying to avoid having to reinstall the entire OS X.....