Automation services, send email, has empty images

The png images within an email sent via Automation Services are blank or empty.

Solution:-
Check the Automation Services Spotfire.Dxp.Worker.Host.exe configuration file.
Check that the following is set to -1, or at least a sensible value.

<setting name="ExportRendererCount" serializeAs="String">
  <value>-1</value>
</setting>

If this value is large, it can cause the Renderer to not work.
Use -1 for default number of processes.

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https://perkinelmer.zendesk.com/agent/tickets/230870