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I have the same problem. I don't think it is due to conflicts between different versions of python.
$ sudo pacman -Ql wxpython
This command will list all the files installed for wxpython, and you should notice that everything is installed in the python2 site-package directory.
I tried using the latest version of rxgraph from the developer, to no avail.
I believe the problem has to due with cairo and pycairo. You can try installing a local copy of an earlier version of cairo and pycairo (e.g. 1.8). Use the same version that Ubuntu uses. I haven't tried this myself, as I don't need the diagrams badly enough...