Highly recommend installing the Lacerte Tool Hub: https://proconnect.intuit.com/support/en-us/help-article/system-responses/fix-common-problems-errors...

After installing, or if you already have this tool installed we recommend running the PDF repair tool. The PDF repair tool often corrects this experience without any additional steps required.

If after doing this you continue to have trouble sending the eSignature your best bet will be to contact technical support so we can troubleshoot further.