Oh wow! That's great news. Definitely keep me posted. I did a little more digging on my end.. we use Joomla's JPath::find function to look for any themes you may have.. that function (within Joomla) *does* use the realpath function, which Edwin indicates can cause problems. That's an internal Joomla function though, which is what we're supposed to use, so not sure what we could do about that.
You may want to point that out to him (or this post) as it may help as well.
Thanks,
Alex