Hi Chris,
I have the Add-On named Signature added to: http://test.hollandbuscompany.com/service/warranty/warranty-claim-form/ -- you provided me with additional code to make it show in the resultant email to "Message":
{all_fields}
<img src='{Signature:8}' alt='{Customer Name (First):1.3} {Customer Name (Last):1.6} signature' />
Instead of the signature image, though, I get the following code-text at the bottom of the form fields results:
<img src='http://test.hollandbuscompany.com?page=gf_signature&signature=512f7434484da6.37252821' alt='Steve Colthorp signature' />
Can you help further? You mentioned it worked well on your server, but doesn't seem to work on this site's setup... Keep me posted!
Steve C.
3Cstudio