The Cube is hashing at ~32GHs on low clock so everything seems to be OK.
I'm on a Mac 10.8.5 using Stratum Proxy.
Where did you get the Stratum Proxy or did you compile it yourself? Does it support 'Long Poll"? I would really like to try that.
Scroll down to Mac install section.
My cube is showing LP Requests as 164 for a term of 16-20 hrs.
Ken