dot file created from schemaspy wont render

I have been using dot in conjunction with schemaspy to create database relationship diagrams.
dot is hanging on some diagrams. I have looked at a number of diagrams and cannot see any obvious differences.
I have run dot from the command line to see if I get any messages etc by using the -q flag but I get no further clues.
Is there a way of identifying what is cause dot to hang/spin etc!!
Below is my latest test
Thanks for any advice

Steve M

C:\Program Files (x86)\Graphviz2.31\bin>dot -v -Tpng -O -q3 SU.1degree.dot
dot - graphviz version 2.31.20130320.0445 (20130320.0445)
libdir = "C:\Program Files (x86)\Graphviz2.31\bin"
Activated plugin library: gvplugin_pango.dll
Using textlayout: textlayout:cairo
Using render: cairo:cairo
Using device: png:cairo:cairo
Activated plugin library: gvplugin_dot_layout.dll
Using layout: dot:dot_layout
The plugin configuration file:
C:\Program Files (x86)\Graphviz2.31\bin\config6
was successfully loaded.
render : cairo dot fig gd gdiplus map pic pov ps svg tk vml vrml xdot
layout : circo dot fdp neato nop nop1 nop2 osage patchwork sfdp twopi
textlayout : textlayout
device : bmp canon cmap cmapx cmapx_np dot emf emfplus eps fig gd gd2 gif gv imap imap_np ismap jpe jpeg jpg metafile pdf
pic plain plain-ext png pov ps ps2 svg svgz tif tiff tk vml vmlz vrml wbmp xdot
loadimage : (lib) bmp eps gd gd2 gif jpe jpeg jpg png ps svg
fontname: "Helvetica" resolved to: (ps:pango Arial, ) (PangoCairoWin32Font) "Arial 10.9990234375"
network simplex: 8 nodes 9 edges maxiter=2147483647 balance=2
network simplex: 8 nodes 9 edges 0 iter 0.00 sec
network simplex: 4 nodes 9 edges maxiter=2147483647 balance=2
network simplex: 4 nodes 9 edges 0 iter 0.00 sec
network simplex: 9 nodes 10 edges maxiter=2147483647 balance=2
network simplex: 9 nodes 10 edges 0 iter 0.00 sec
network simplex: 4 nodes 10 edges maxiter=2147483647 balance=2
network simplex: 4 nodes 10 edges 0 iter 0.00 sec
network simplex: 14 nodes 15 edges maxiter=2147483647 balance=2
network simplex: 14 nodes 15 edges 0 iter 0.00 sec
network simplex: 4 nodes 15 edges maxiter=2147483647 balance=2
network simplex: 4 nodes 15 edges 0 iter 0.00 sec
network simplex: 14 nodes 15 edges maxiter=2147483647 balance=2
network simplex: 14 nodes 15 edges 0 iter 0.00 sec
network simplex: 4 nodes 15 edges maxiter=2147483647 balance=2
network simplex: 4 nodes 15 edges 0 iter 0.00 sec
network simplex: 37 nodes 72 edges maxiter=2147483647 balance=2

Without seeing the graph, it

Without seeing the graph, it is very hard to say. You should consider submitting a bug report http://www.graphviz.org/content/graphviz-issue-tracker with a graph causing the problem.

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