Hi Steph
I very much doubt that not calling the web service could have caused any problems directly.
Does the workflow start correctly if you completely remove the web service invocation?
How do you know that the process didn't start?
Is the process long-lived?
Do you have an xfa-form as an input variable of your process?
Have you added the correct Workflow fields to your form, or just a single submit button?
Howard
http://www.avoka.com