[O] Embedded dot not compiling>

[Peter Davis]

I've been using org-mode for a while, in some cases with embedded dot code. 
This has worked pretty smoothly for me in the past, but
for some reason, I'm not getting any png output from my graphs now. The doc I'm 
started is included below, in its entirety since
it's still pretty small.

Anything jump out? I don't see any errors, but the png file is not created.

Thanks!
-pd



#+STARTUP: showeverything logdone
#+options: toc:nil num:nil
#+title: Test Flows


* Buyer rates/reviews

#+BEGIN_SRC dot :file brr.png :cmdline -Kdot -Tpng
digraph G {
  node [shape=box];
  node ssi [label="Seller signs in"];
  node sca [label="Seller creates asset"];
  node scp [label="Seller creates app"];
  node sso [label="Seller signs out"];
  node asi [label="Admin signs in"];
  node aaa [label="Admin approves asset"];
  node aap [label="Admin approves app"];
  node aso [label="Admin signs out"];
  node bsi [label="Buyer signs in"];
  node bpa [label="Buyer purchases asset"];
  node bpp [label="Buyer purchases app"];
  node brr [label="Buyer rates and/\nor reviews"];
  node bso [label="Buyer signs out"];

  ssi -> sca -> sso;
  asi -> aaa -> aso;
  bsi -> bpa -> brr -> bso;
}
#+END_SRC