I was preparing today to give a demonstration on SharePoint 2010 focusing on SPD 2010 workflows.  As I was prepping, I hit this error when I tried to run a workflow manually:

The form cannot be rendered. This may be due to a misconfiguration of the Microsoft SharePoint Server State Service. For more information, contact your server administrator.

I had previously set up my farm on an underpowered laptop and in trying to help it out, I tried to turn off / disable a bunch of services, as shown:

It turns out that the State Service is pretty important 🙂

I reconnected my web app to the State Service I was immediately able to run my workflows.

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