Hello,
Yeah I have this problem too, It has had me tearing my hair out pretty much with frustration. Finaly stumbled onto this thread and happy its not a hardware problem as I was about to send my new microphones back as the problem was still there when I got my repaired box back.
It is a tad strange that to use the included sofware I got I had to upgrade my operating sys on the mac, but when you do it makes the r16 incompatible... tried garage band 11 and thought it may help to no avail. If I downgrade my OS back to it's prev version, the R16 works but the software does not.. arg! I am stuck in a crap loop of non compatibilty!
so.. now I know what the problem is I am little reassured that my gear is fine but I am on a recoding schedule for my band and this problem has caused us to be delayed by nearly a month now. I am having to deal with some unhappy people at the moment :/