lruskauff:
Think I found the answer but you won't like it. It is a function of the template, I.e. It only works with the pop up. As to why you are having to edit the code, I suspect maybe a file in wrong location.
Read this : https://www.zen-cart.com/showthread.php?212899-Tableau-Responsive-Theme-Support-Thread&p=1246503&highlight=Shipping#post1246503
Post number 42 from numinex. There is also a post at the top of the thread of someone who installed successfully. You might contact him to ask if he had to modify the code.
Lruskauff
That's what I was afraid of. I just installed a test site with the demo products, and tableau template with nothing else, and it only works as a popup. What's really sad, is that post is over a year and a half old, and they still don't have it right. Funny thing is, that when I switch back to the default template at the test site, the shipping estimator works fine with no errors.
redsautorehab.com/test/
Now I need to look into the issue with the Ipad.