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
dot - graphviz version 2.31.20130320.0445 (20130320.0445)

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