I followed the instructions step by step from http://docs.rhomobile.com/rhodes/install#mac-os to install RhoStudio on a Macbook. Also have installed the right version of Ruby and RVM.
When i run RhoStudio and do File->New Project->RhoMobile application and finish on next screen i get the message prompt "Cannot find Rhodes need version equal or greater 3.2.0"
With help from Derek Warren from Motorola i was able to fix this issue and was able to successfully install and use RhoStudio on Macbook.
Couple of thing I had to do.
1. Download ruby when outside corporate firewall.
2. Install XCode command line tools manually since it is not installed by default with Xcode 4.5
3. To install Ruby i ran the command
rvm install 1.9.3 --with-gcc=clang