It was brought to my attention that the wallet will not execute on 10.6, I'm looking into this, but can't promise a delivery. iirc, Apple recently dropped support for 10.6, so if you're on it, you should really consider upgrading to 10.9 as you're prone to security risks.
I only have a 10.9 (mavericks) OSX machine. If anyone happens to be running 10.7 or 10.8, please give the wallet a twirl. However, I'm not sure why you'd be running 10.7 or 10.8 either because 10.8 and 10.9 were free upgrades!
If you have an issue, please pm me directly so that its brought to my immediate attention (I can't promise to read every post in this thread).
I am somewhat new to OSX, and to my knowledge even though libc++ and clang++ were present in 10.7 and 10.8, they were not the standard stdlib and compiler until 10.9.
If I don't hear anything regarding 10.7 and 10.8 by tomorrow evening, I'll look into testing on VMs.