emacs workgroups and interpreters

emacs workgroups and interpreters

I have installed workgroups2 from melpa and am trying to configure my
ideal workgroups. For my first work group, I wish to have 4 windows. In
the first window will by an R script (code written in R) in the window
next to it will be an R interpreter. In the 3rd window will be python code
and likewise, the window next to it will be a python interpreter.
I created this setting in emacs:
Next, I saved the workgroup and then proceeded to test it. I closed emacs,
reopened it and loaded the workgroup. To my surprise, neither of the
interpreters were loaded.
How can I get both the python interpreter and R interpreter to be saved in
a workgroup?
Is it possible to save interpreters in workgroups?
Note that I use emacs 24.3 and Ubuntu 12.04 LTS. Thanks for all the help!