The latest developer version is Build 201310170836 which is what you have. That's actually Rev.68, despite it saying Rev.50.
Yes agreed, the modeling part is not quite working on the Rev.68 version of OS X. The XS stuff works great though.
I also use a Win 7 VM for Modeling. I have it on a server-based VMWare, running next to the HANA system. This way it performs better.
John