Hello Hilary,
I've been watching your demos on SharePoint/InfoPath for about a decade online.
I don't see any errors. I have added custom JQuery Code to add a Signature Box to an InfoPath Browser form, but when I do any postback from like a query filter or People picker selection; it defaults back to a regular textbox and the code is no longer applied. If I manually refresh the browser the code is activated again.
hope this helps,
Michael